Named for a Scottish immigrant, for 10 points, identify this first professional detective agency in America.
This organization played a key role in a series of conflicts between jockey clubs and poolroom gamblers.  Its namesake, who was nearly killed in Windsor, Ontario, by George Johnson, had such rivals as the self-promoting William Burns, and a man named Charles Siringo a former employee and author who identified this organization as one of Two Evil Isms.  Its New York office was headed by George Bangs, while other notable employees include James McParlan, whose published adventures in the coal fields of Pennsylvania were analyzed in Michael Denning's Mechanic Accents.  This organization, which sent its "operatives" after such groups as the James Brothers, advertised its services with the motto, "The Eye that Never Sleeps."  After suppressing the Molly Maguires, they cemented their notoriety by helping break the Homestead Strike.  Named for a Scottish immigrant, for 10 points, identify this first professional detective agency in America.
This organization played a key role in a series of conflicts between jockey clubs and poolroom gamblers.  
Pinkerton Detective Agency or Pinkertons or Pinkerton Detectives or Men or Operatives