In 1914, the outbreak of World War I, he organized and headed the Commission for Relief in Belgium, an international relief organization that provided food to occupied Belgium. When the U.S. entered the war in 1917, President Woodrow Wilson appointed Hoover to lead the Food Administration. He became famous as his country's "food dictator". After the war, Hoover led the American Relief Administration, which provided food to the starving millions in Central and Eastern Europe, especially Russia. Hoover's wartime service made him a favorite of many
progressives, and he unsuccessfully sought the Republican nomination in the 1920 U.S. presidential election.
Hoover served as Secretary of Commerce under presidents Warren G. Harding and Calvin Coolidge. Hoover was an unusually active and visible Cabinet member, becoming known as "Secretary of Commerce and Under-Secretary of all other departments." He was influential in the development of air travel and radio. Hoover led the federal response to the Great Mississippi Flood of 1927.
https://en.wikipedia.org/wiki/Herbert_Hoover