 When after President Madero's murder the rest of the family fled to the U.S., their support for Carranza was public knowledge.However, what made the Hopkins papers so combustible was the undeniable link between major parts of the U.S. government, oil and railroad interests headed by Flint and Pierce, and certain factions within the Constitutionalists headed by Carranza and Pancho Villa.The appearance of impropriety was undeniable.