Public Interest Litigation (PIL) in India: History, Purpose, and Landmark Cases

In 1979, a journalist named Chameli Singh wrote a letter to the Supreme Court of India. Not a formal petition drafted by lawyers on expensive stamp paper. Just a letter — describing the horrific conditions in which undertrial prisoners were being kept in Bihar jails. No bail, no trial, no end in sight. Some of them had been locked up longer than the maximum sentence their alleged offence could have attracted.

The Supreme Court treated that letter as a writ petition and took up the case.

That moment quietly changed Indian legal history. It showed that justice does not always need a lawyer in a suit, a courtroom appearance, or a hefty filing fee. Sometimes, a letter is enough.

That is the spirit of Public Interest Litigation.

What Is PIL, Really?

PIL stands for Public Interest Litigation. In simple terms, it is a legal mechanism that allows any person — not necessarily the one directly affected — to approach a court and seek justice on behalf of those who cannot do so themselves.

Traditional litigation works on one basic rule: only the person whose rights have been violated can go to court. You need what lawyers call locus standi — the legal standing to file a case. If you are not the aggrieved party, you typically have no business walking into court.

PIL throws that rule open. Under PIL, if a matter involves a public cause or affects a large section of people — especially the poor, the marginalised, or those without access to the legal system — the court can hear it at the initiative of any public-spirited individual or organisation.

The aggrieved party does not even need to know a case is being filed on their behalf.

Where Does PIL Come From? The Constitutional Foundation

PIL is not a statute. No Parliament passed a law called the “Public Interest Litigation Act.” It grew out of judicial interpretation of the Constitution — specifically Articles 32 and 226.

• Article 32 gives every person the right to move the Supreme Court directly for the enforcement of Fundamental Rights. Dr. B.R. Ambedkar called this “the heart and soul of the Constitution.”
• Article 226 gives High Courts similar powers within their respective jurisdictions.

For decades, these provisions were used in the conventional way — the aggrieved person files a petition, the court hears it, relief is granted or denied. PIL expanded this by relaxing the requirement that the petitioner be the person whose rights were violated.

The procedural flexibility also extended to how a case could be filed. Instead of a formal writ petition, courts began accepting:

• Letters addressed to the Chief Justice
• Newspaper reports treated as petitions
• Telegrams
• Even postcards

This is called epistolary jurisdiction — the court’s power to treat informal communications as actionable petitions. It is uniquely Indian and extraordinarily powerful.

How PIL Started?

The Role of Justice P.N. Bhagwati and Justice V.R. Krishna Iyer

Two judges did more than anyone else to build PIL into what it is today.

Justice V.R. Krishna Iyer began loosening the rules of locus standi in the mid-1970s. He argued that when the poor cannot access courts because of poverty, illiteracy, or ignorance, the courts must go to them — not the other way around. He started accepting cases filed by third parties acting in good faith on behalf of the disadvantaged.

Justice P.N. Bhagwati gave PIL its formal shape and its name. He openly declared that the traditional rule of locus standi was incompatible with constitutional goals in a country where millions were too poor or too powerless to approach courts on their own. In S.P. Gupta v. Union of India (1981) — one of the most important cases in Indian legal history — he articulated the PIL framework clearly:

“Any member of the public or social action group acting bona fide can invoke the jurisdiction of the High Courts under Article 226…to seek redressal against violation of a legal or constitutional right of any person who due to social or economic disability is unable to approach the court.”

That statement became the foundation of modern PIL practice.

The Early Landmark Cases That Built PIL

Hussainara Khatoon v. State of Bihar (1979)

This is where it all really began. Advocate Pushpa Kapila Hingorani filed a petition (drawing from a news report) highlighting that tens of thousands of undertrial prisoners in Bihar had been in jail for years — without trial, without legal aid, and without any meaningful access to justice.

The Supreme Court held that the right to a speedy trial is a part of the right to life and personal liberty under Article 21. It ordered the release of over 40,000 undertrial prisoners who had already served time beyond the maximum punishment their alleged offences carried.

A newspaper report. Forty thousand people released. That is PIL at its most powerful.

Sunil Batra v. Delhi Administration (1980)

A prisoner wrote a letter to Justice Krishna Iyer describing how a fellow prisoner was being subjected to brutal torture by jail authorities, including being pierced with a stick in a deeply degrading manner.

The court treated the letter as a writ petition, held an inquiry, and laid down comprehensive guidelines on prison conditions and prisoner rights. It confirmed that prisoners do not lose their fundamental rights simply because they are behind bars.

S.P. Gupta v. Union of India (1981) — The Judges’ Transfer Case

This case formally opened the gates of PIL to “public-spirited” individuals even in matters not directly concerning their own rights. The case involved the transfer and non-appointment of certain judges, which lawyers argued violated judicial independence.

The Supreme Court used this case to deliver its broadest articulation of PIL jurisdiction yet — holding that any member of the public could approach the court in matters involving public interest, and that the traditional locus standi requirement had to be relaxed in the Indian context.

Bandhua Mukti Morcha v. Union of India (1984)

The Bandhua Mukti Morcha (Bonded Labour Liberation Front) filed a writ petition about bonded labourers working in stone quarries in Haryana under conditions amounting to slavery — no wages, no freedom, no legal protection.

The Supreme Court appointed a commission to visit the quarries, collect evidence, and report back. It held that bonded labour violates Articles 21 and 23, and directed the government to take immediate steps for identification, release, and rehabilitation of bonded labourers.

This case showed that PIL could do something ordinary litigation cannot: prompt the court to take an active investigative role rather than simply waiting for both sides to present their arguments.

M.C. Mehta v. Union of India — A Series of PILs That Changed India

M.C. Mehta, an environmental lawyer, filed multiple PILs over the course of decades that reshaped how courts handle environmental protection in India.

• Oleum Gas Leak Case (1987): After a toxic gas leak from the Shriram Food and Fertilisers plant in Delhi, the Supreme Court developed the absolute liability principle — a company engaged in a hazardous activity is absolutely liable for any harm caused, with no exceptions, regardless of what precautions it took. This went further than the old English principle of strict liability from Rylands v. Fletcher, which allowed certain defences.
• Ganga Pollution Case: Mehta filed a PIL to stop the discharge of effluents from tanneries and other industries into the Ganga. The court shut down hundreds of polluting units and established the principle that the right to live in a pollution-free environment is part of Article 21.
• Delhi Vehicular Pollution Case: PIL by Mehta led to the Supreme Court ordering the conversion of Delhi’s entire public transport fleet — buses, autos, taxis — to Compressed Natural Gas (CNG). That single court order transformed air quality monitoring and transport policy in the national capital.

Vishaka v. State of Rajasthan (1997)

Bhanwari Devi, a social worker in Rajasthan, was gang-raped when she tried to prevent a child marriage. The case was acquitted at the trial court level. Following that, women’s rights organisations filed a PIL.

In the absence of any specific law on sexual harassment at the workplace, the Supreme Court stepped in and laid down the Vishaka Guidelines — a set of binding directions that every employer was required to follow to prevent and address sexual harassment. These guidelines had the force of law until Parliament finally enacted the Sexual Harassment of Women at Workplace (Prevention, Prohibition and Redressal) Act in 2013.

A gang rape case, a failed trial, a PIL — and the outcome was guidelines that protected millions of working women for over fifteen years until formal legislation arrived.

Olga Tellis v. Bombay Municipal Corporation (1985)

Pavement dwellers in Bombay challenged the municipal corporation’s drive to evict them from the footpaths where they lived and worked. The court held that the right to livelihood is part of the right to life under Article 21 — you cannot strip someone of their means to earn a living without due process. This significantly expanded the scope of what “life” means constitutionally.

Unni Krishnan v. State of Andhra Pradesh (1993)

Before the 86th Amendment inserted Article 21A into the Constitution, this PIL-rooted case held that the right to education is a fundamental right flowing from Article 21. Children up to 14 years of age have the right to free education. The state is obligated to provide it.

What Makes PIL Different from Ordinary Litigation

Feature	Ordinary Litigation	PIL
Who can file	Only the aggrieved person (locus standi required)	Any public-spirited person or group
Filing method	Formal petition with prescribed format	Can be a letter, telegram, or newspaper report
Court fees	Standard court fees apply	Minimal or nominal fees
Purpose	Enforce individual rights	Enforce rights of a group or the public at large
Court’s role	Adjudicatory — decides between two parties	Often inquisitorial — court appoints commissioners, monitors compliance
Outcome	Binding on the parties	Often results in policy-level directions binding on the government

The Expansion of PIL

Over the decades, PIL has touched almost every area of public life in India:

• Prison reforms: Conditions of detention, rights of undertrial prisoners, overcrowding
• Environment: Pollution control, forest conservation, protection of wildlife habitats
• Child rights: Child labour, right to education, trafficking
• Women’s rights: Sexual harassment, dowry deaths, gender discrimination
• Bonded and forced labour: Identification, release, and rehabilitation
• Corruption and accountability: Several PILs have triggered investigations into public officials
• Electoral reforms: The Election Commission’s powers were shaped partly through PILs
• Healthcare: Access to essential medicines, functioning of public health infrastructure

PIL Misuse and Judicial Concern

PIL has faced serious criticism too, and the Supreme Court itself has acknowledged it.

The same accessibility that makes PIL powerful has also made it easy to misuse. Over the years, courts have had to deal with:

• Publicity PILs: Filed not to serve a public cause but to generate media attention for the petitioner
• Proxy PILs: Disguised corporate or political disputes dressed up as public interest matters
• Frivolous PILs: Cases that waste court time and delay genuine matters
• Personal grudge PILs: Filed by individuals to harass specific targets under the cover of “public interest”

The Supreme Court has repeatedly cracked down. In Dattaraj Nathuji Thaware v. State of Maharashtra (2005), the court said PIL has become “a tool in the hands of unscrupulous persons to file motivated petitions” and warned that such misuse must be dealt with firmly, including by imposing costs.

Justice Bhagwati himself — the man who championed PIL — later expressed concern that the instrument he helped create was being weaponised for purposes it was never intended for.

Courts now apply a preliminary filter: Is the petition genuinely in public interest? If not, it gets dismissed at the threshold, often with exemplary costs imposed on the petitioner.

PIL vs. Private Interest Litigation: The Core Distinction

The one question every court asks when a PIL lands on its desk:

Is this really about the public, or is it about the petitioner?

If someone files a PIL challenging a government contract because their own competing bid was rejected, that is private interest litigation wearing a PIL costume. Courts see through it quickly.

Genuine PIL must:

• Concern a right or grievance that affects the public or a section of the public
• Be filed by someone with no personal stake in the outcome (or a minimal, incidental one)
• Seek relief that benefits others, not primarily the petitioner
• Be based on credible, verifiable facts — not rumour or speculation

PIL Today: Still Relevant, Still Necessary

PIL remains one of the most significant instruments of constitutional justice in India. In a country where lakhs of people live below the poverty line, where literacy rates are still uneven, and where legal aid infrastructure is stretched thin — PIL bridges the gap between constitutional promises and constitutional reality.

When farmworkers are denied minimum wages, when a river is being slowly poisoned by industrial discharge, when children are found working in factories, when prisoners are held in inhuman conditions — the PIL mechanism exists precisely so that someone can walk into court and say: this is wrong, and the Constitution demands better.

The courts do not always get it right. PIL can be slow. Court orders can go unimplemented. The gap between directions and action on the ground can be enormous. These are real limitations.

But the alternative — a legal system where justice is only available to those who can afford a lawyer, understand a court process, and have the luxury of time — would be far worse.