 In 1907, during the trial of the Western Federation of Miners' Bill Haywood, Siringo was assigned as a bodyguard for Albert Horsley.After the acquittal, Siringo warned Idaho Governor Frank Gooding of plans to lynch Haywood, Pettibone, Charles Moyer, and Haywood's lawyer Clarence Darrow, which prevented the hanging.In 1907, Siringo married Grace, after resigning from the Pinkertons.