Step 1: Understanding the Concept:
Public Interest Litigation (PIL) allows any public-spirited individual to approach the court for the protection of the interests of a group of people.
Step 2: Detailed Explanation:
The Hussainara Khatoon v. State of Bihar (1979) case is known as the first reported PIL case in India.
A petition was filed regarding the plight of thousands of under-trial prisoners languishing in Bihar jails for periods longer than their potential maximum sentences.
The Supreme Court ruled that the "Right to a speedy trial" is a fundamental right under Article 21.
Step 3: Final Answer:
Hussainara Khatoon (1979) was the first reported PIL case.