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The papers consist of letters, notes, photographs, clippings, and miscellaneous papers concerning United States vs. Ricardo Flores Magon, 1918-1923. Weinberger attempted to obtain amnesty for Ricardo Flores Magon, who together with his brother Enrique Flores Magon and Librado Rivera, was convicted under the wartime Espionage Law for articles appearing in his periodical Regeneracion. Ricardo Flores Magon was not freed despite Weinberger's repeated insistance that his health was rapidly deteriorating in prison. He died in the United States Penitentiary in Leavenworth in 1920. Interest in this case was widespread throughout the United States and Mexico, due in large part to Weinberger's relentless letter writing. Among those interested in this case were Alice Stone Blackwell, Norman Hapgood, Alvaro Obregon, and Upton Sinclair.