Within Palmer's Justice Department, the General Intelligence Division (GID), headed by J. Edgar Hoover, had become a storehouse of information about radicals in America. It had infiltrated many organizations and, following the raids of November 1919 and January 1920, it had interrogated thousands of those arrested and read through boxes of publications and records seized. Though agents in the GID knew there was a gap between what the radicals promised in their rhetoric and what they were capable of accomplishing, they nevertheless told Palmer they had evidence of plans for an attempted overthrow of the U.S. government on May Day 1920.