"A year later he [Guston] was in the thick of Communist Party circles around the John Reed Club. And he became the target of an LAPD Red Squad raid for his contribution to an exhibition devoted to the racially motivated trial of the Scottsboro Boys, for which he painted a picture about lynching that was the first of many of his works to feature ominous images of 'Ku Klux Klansmen'. Shortly thereafter Guston was on his way to Morelia in central Mexico to work on a commission under the patronage of revolutionary muralist David Alfaro Siqueiros - later Pollock's teacher in New York. By the end of 1934 he was back in California, where he joined the New Deal-sponsored Public Works of Art Project and realized a mural for the International Ladies Garment Workers Union."