Spokesman James P. Rubin said the four were arrested for conducting peaceful pro-democracy activities and have never been given a free, fair and public trial.
The four are Martha Beatriz Roque, Vladimiro Roca, Felix Bonne and Rene Gomez Manzano, leaders of Cuba's Dissident Working Group.
``We call on Fidel Castro not to resist the democratic tide of history and individual human dignity, and to release these four -- and all other -- political prisoners,'' Rubin said.
© Copyright 1998 The Associated Press