When the FBI was initially established, which type of crime did it NOT investigate?

The FBI was established in 1908, initially focusing on federal offenses that were problematic at the time. Among these were national banking crimes, naturalization crimes, and peonage crimes.

National banking crimes pertained to the regulation and enforcement of laws regarding banking practices. Naturalization crimes involved the fraudulent or deceptive practices used by individuals seeking U.S. citizenship. Peonage crimes referred to the system where individuals were bound in servitude or forced labor to pay off debts, which was prevalent during that period.

On the other hand, drug-related crimes were not among the FBI’s earliest concerns. Although drug enforcement became a significant part of the FBI’s mission later, especially with the rise of organized crime and drug trafficking in the mid-20th century, the agency did not initially focus on these crimes at the time of its formation. Thus, the correct answer highlights the FBI's original mandate and the evolution of its investigative priorities over time.