Thiel Detective Service Company Thiel Detective Service Company The Thiel Detective Service Company was a private detective agency formed by George H. Thiel, a former Civil War spy and Pinkerton employee. The Thiel Detective Service Company headquarters were in St. Louis, Missouri. The company was formed to be a direct competitor to the Pinkerton Detective Agency, but never achieved this status. The Burns Detective Agency was Pinkerton's largest competitor. The Thiel Agency was involved in infiltrating and breaking a number of labor union strikes in the United States and Canada, much as the Pinkerton agency was. After the Homestead Strike, the Thiel Detective Agency,
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