What significant law enforcement agency emerged during the 1900-1940 era?

The Federal Bureau of Investigation (FBI) emerged as a significant law enforcement agency during the 1900-1940 era, particularly when it was officially established in 1908. The FBI was created in response to the need for a federal agency capable of handling complex and interstate criminal activities. It began with an emphasis on investigating various types of crime, including and not limited to, corruption and serious crimes that crossed state lines.

With the expansion of federal laws and the complexity of crime in the early 20th century, the FBI adapted and grew in scope and responsibilities. It also played a crucial role during the Prohibition era and the gang violence that was rampant at that time. By the late 1930s, the agency was actively involved in combating organized crime, which would become one of its primary focuses in the following decades.

In contrast, while the U.S. Marshals have a long history dating back to 1789, they focused more on federal fugitive apprehension and enforcement of federal court decisions. The DEA (Drug Enforcement Administration) was not established until 1973, focusing specifically on drug-related crimes. The ATF (Bureau of Alcohol, Tobacco, Firearms and Explosives), which deals with