Various versions of the Internal Security Act, 1982, exist:
- as enacted on 9 June 1982 and as came into force on 2 July 1982.
- as amended on 26 June 1986 by the Internal Security Amendment Act, 1986.
- as amended on 3 February 1990 by Proclamation No. R. 21 of 1990.
- as amended on 31 July 1991 by the Internal Security and Intimidation Amendment Act, 1991.
- as amended on 11 March 1992 by the Criminal Law Amendment Act, 1992.
- as amended on 31 July 1992 by the Criminal Law Second Amendment Act, 1992.
- as amended on 28 January 1994 by the Abolition of Restrictions on Free Political Activity Act, 1993.
- as amended on 29 April 1994 by section 7 of the Abolition of Restrictions on Free Political Activity Act, 1993.
- as amended on 15 November 1996 by the Regulation of Gatherings Act, 1993 and the Safety Matters Rationalisation Act, 1996.
The act was repealed on 20 May 2005 by the Protection of Constitutional Democracy against Terrorist and Related Activities Act, 2004.