His son Michael Klonsky also became active in politics, becoming a national secretary of the Students for a Democratic Society and later leader of the Communist Party (Marxist-Leninist).
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Klonsky and Walter Lowenfels were defendants in a trial in the mid-1950s of nine Philadelphia members of the Communist Party.
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Klonsky's father, Robert Klonsky, a World War II veteran who fought as a volunteer against the Nationalists during the Spanish Civil War, had been arrested and convicted of "conspiring to advocate Marxist views" in violation of the Smith Act during the McCarthy period.