This term for an FBI agent dates back to before the 1920s
But they 
would, ironically, hasten into being the first force of federal agents that would later 
... hired nine of the Secret Service investigators he had borrowed before and 
brought ... By the late 1920s, these wanted flyers were circulating not only 
throughout the... [DOC] [TLE] Federal Bureau of Investigation - Wikipedia [PAR] The Federal Bureau of Investigation (FBI) is the domestic intelligence and 
security service of .... During the "War on Crime" of the 1930s, FBI agents 
apprehended or killed a ... Hoover began using wiretapping in the 1920s during 
Prohibition to arrest ..... unless they resign or are fired by the President before 
their term ends.