Back in New York in 1936, he was the guest of honor at the "Contemporary Arts" exhibition at the St. Regis gallery. There he also ran a political art workshop in preparation for the 1936 General Strike for Peace and May Day parade. The young Jackson Pollock attended the workshop and helped build floats for the parade. In fact, Siquieros has been credited with teaching drip and pour techniques to Pollock that later resulted in his all-over paintings, made from 1947 to 1950, and which constitute Pollock's greatest achievement. In addition to floats, the Siqueiros Experimental Workshop produced a variety of posters and other ephemeral works for the CPUSA and other anti-fascist organizations in New York. These ephemeral works possessed the ability to reach the masses in a way different from mural painting because they were accessible to a wide audience outside of an institution or gallery. The Siqueiros Experimental Workshop only lasted for a little over a year until Siqueiros went to fight in the Spanish Civil War in April 1937, but their floats were featured in both the 1936 and 1937 May Day Parades in Manhattan's garment district.