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P4W Prison for Women - 1981 was released on:
Canada: 11 September 1981 (Toronto Film Festival) (premiere)
USA: October 1981 (Chicago International Film Festival)
USA: December 1981
There are quite a few movies that you could be referring to. It could be the 1985 film Women in Fury or the 1950's film Caged.
Women in Prison - 1987 Goldfingers 1-2 was released on:
USA: 24 October 1987
Soliloquies from Women in Prison - 2009 was released on:
USA: 1 April 2009 (Aspen Short Film Festival)
Canada: 16 June 2009 (CFC Festival)
USA: 15 January 2010 (Sundance Film Festival)
Prison Women - 2011 County Jail 1-2 was released on:
USA: 23 February 2011