In 1933 Gross joined the government's PWAP (Public Works of Art Project), which transitioned into the WPA (Works Progress Administration), which Gross worked for later in the 1930s. Under these programs Gross taught and demonstrated art, made sculptures that were placed in schools and public colleges, made work for Federal buildings including the Federal Trade Commission Building, and for the France Overseas and Finnish Buildings at the 1939 New York World's Fair. Gross was also recognized during these years with a silver medal at the Exposition universelle de 1937 in Paris, and in 1942, with a purchase prize at the Metropolitan Museum of Art's "Artists for Victory" exhibition for his wood sculpture of famed circus performer Lillian Leitzel.