This collection contains material spanning the long life and various careers of Pedro J. Gonzalez. It documents his service with Pancho Villa during the Mexican Revolution, his time as a radio personality and recording artist in Los Angeles, his imprisonment at San Quentin on a trumped-up rape charge, and his activism on behalf of veterans of the Mexican Revolution. It consists of correspondence, photographs, clippings, song lyrics, court documents, ephemera, and material on music copyright and royalties. There are several 78 rpm audio recordings, mostly of Gonzalez's band Los Madrugadores. There is also a great deal of material on ejidos, the communal farms that were often granted to veterans of the Mexican Revolution.