Among the most dangerous criminals of the public enemies era was a man who has long hidden in history's shadows: Tom Brown. In the early 1930s, while he was police chief of St. Paul, Minnesota, Brown became a secret partner of the infamous Barker gang. He profited from their violent crimes, he protected the gang from raids by the nascent FBI—and while he did all this, the gangsters gunned down cops and citizens in his hometown.<br /><br />Big Tom Brown,...