Parti libéral mexicain
In 1906, he joined the "Partido Liberal Mexicano" (Mexican Liberal Party) whose members were against the re-election of President Porfirio Díaz and began participating in clandestine activities for Díaz's opponent Ricardo Flores Magón. In 1910 Alvarado joined the Anti-Reelectionist Party in Sonora, which had been established by, Benjamín G. Hill. Later that same year, he and other young idealists with revolutionary fervor attacked a military barracks in Hermosillo, Sonora. Their failed assault resulted in some of the rebels being executed and others, like Salvador Alvarado, escaped into Arizona.