During World War I, he was an assistant general manager of Bethlehem Steel and developed a friendship with Franklin D. Roosevelt, then Assistant Secretary of the Navy. Kennedy made huge profits from reorganizing and refinancing several Hollywood studios, ultimately merging several acquisitions into Radio-Keith-Orpheum (RKO) studios. After Prohibition ended in 1933, Kennedy consolidated an even larger fortune when his company, Somerset Importers, became the exclusive American agent for Gordon's Gin and Dewar's Scotch. He owned the largest office building in the country, Chicago's Merchandise Mart, giving his family an important base in that city and an alliance with the Irish-American political leadership there.