February 1, 1996: Hope for Labor (letter)
September 27, 1990: An Open Letter on Anti-Armenian Pogroms in the Soviet Union (letter)
December 6, 1984: Crackdown in Yugoslavia (letter)
April 2, 1981: Being True to Heidegger (letter)
February 19, 1981: Repression in Latin America (letter)
December 4, 1980: The New Plight of the Praxis Professors (letter)