Step 1: Understanding the Concept:
The question asks to identify the landmark Supreme Court case that held that solitary confinement, which curtails a prisoner's right to interact with fellow prisoners, is a violation of the Right to Life and Personal Liberty under Article 21 of the Constitution. This case is a cornerstone of prisoners' rights jurisprudence in India.
Step 2: Detailed Explanation:
In the case of Sunil Batra v. Delhi Administration, the Supreme Court, through the powerful judgments of Justice V.R. Krishna Iyer, held that prisoners are not stripped of their fundamental rights upon incarceration. The Court ruled that imposing solitary confinement is a severe punishment that can only be imposed by a court of law and not by prison authorities. It was held that subjecting a prisoner to solitary confinement without due judicial process is a gross violation of their fundamental right under Article 21, as it deprives them of human companionship and leads to mental and psychological degradation. The words in the question are a paraphrase of the reasoning given in this judgment.
- \textit{D.K. Basu} deals with the rights of an arrested person and procedures for arrest.
- \textit{Parmanand Katara} deals with the right to medical assistance for accident victims.
- \textit{Kishore Singh} also deals with prisoners' rights but \textit{Sunil Batra} is the specific and leading authority on solitary confinement.
Step 3: Final Answer:
This was held in the case of Suni Batra Vs. Delhi Administration.