sentences:  Although he never joined the society, he occasionally attended their talks, on one occasion conversing with a teenage Ray Bradbury.Another scientist to become involved in the GALCIT project was Sidney Weinbaum, a Jewish refugee from Europe who was a vocal Marxist; he led Parsons, Malina, and Qian in their creation of a largely secretive communist discussion group at Caltech, which became known as Professional Unit 122 of the Pasadena Communist Party.Although Parsons subscribed to the "People's Daily World" and joined the American Civil Liberties Union (ACLU), he refused to join the American Communist Party, causing a break in his and Weinbaum's friendship.