By the time the United States entered World War I on the side of the Allies, the Bureau had become the premier intelligence and counterintelligence agency of the federal government. Working closely with the Department of State’s Bureau of Secret Intelligence and the War Department’s Military and Naval Intelligence Divisions, Bureau agents supported the war effort on the home front. The volunteers of the American Protective League and ample funding for the first time in its history provided the Bureau with thousands of informants and hundreds of thousands of leads. These new resources also led to abuses of the newfound power. The rounding up of slackers, denouncing of German-Americans, and hunting for “reds” left a mixed record for the Bureau.