Context: Recently, the Supreme Court ordered the release of Newsclick founder-editor, invalidating his arrest in a terror case due to the Delhi Police's failure to inform him of the grounds for his arrest beforehand.
Article 22 of the Indian Constitution
Unlawful Activities (Prevention) Act, 1967 (UAPA)
o If the Centre perceives an activity as illegal, it can proclaim it as such through an Official Gazette.