John Farley and George Thiel founded a major competitor to this group, which was also rivaledby Mooney &amp; Boland. Charlie Siringo wrote a tell-all book about this organization, claiming itorchestrated the fraudulent election of James Peabody as governor of Colorado. A member of thisgroup worked strenuously to prove that Frank Myers was lying in 
John Farley and George Thiel founded a major competitor to this group, which was also rivaledby Mooney &amp; Boland. Charlie Siringo wrote a tell-all book about this organization, claiming itorchestrated the fraudulent election of James Peabody as governor of Colorado. A member of thisgroup worked strenuously to prove that Frank Myers was lying in testimony against corrupt hoteloperator Jacob McLaughlin. Franklin Gowen hired a member of this organization, who used thealias "James McKenna." Frank Geyer's work for this group in finding the Pitezel children led to theexposure of (*) serial killer H.H. Holmes. A member of this organization was responsible for retrievingGeorge Pettibone, Charles Moyer, and Big Bill Haywood from Colorado to stand trial for the murder ofFrank Steunenberg. Seven members of this group died when Henry Clay Frick hired them to break theHomestead strike. For 10 points, name this organization which sent James MacParland undercover toexpose the Molly Maguires, and was a company which hired itself out for union-busting and generalcriminal investigative work in the nineteenth century.
John Farley and George Thiel founded a major competitor to this group, which was also rivaledby Mooney &amp; Boland.
Pinkertons [or Pinkerton National Detective Agency]