The Nazi-Soviet pact of 1939, a traumatic shock to me, ended any ambivalence I had about the Soviet Union, and all cooperation with Communists in united fronts.
Baldwin, Roger (2006) [1971]. "The Roger Baldwin Story: A Prejudiced Account By Himself". in Woody Klein. Liberties Lost: The Endangered Legacy of the ACLU. Westport, CT: Praeger Publishers. p. 11. ISBN 0275985067.