In 1936, the Socialist Party of Pennsylvania severed its connection with the Socialist Party of America over ideological and tactical differences. Hoopes remained with the state organization outside of any national organization. On February 7, 1937 the Socialist Party of Pennsylvania called an "Eastern States Conference of Social Democratic Organizations" in Philadelphia which moved forward towards establishing a new organization, the Social Democratic Federation. Hoopes was named to the 7 member committee which issued a call for a National Convention in Pittsburgh, to be held May 29–31, 1937.