The United States Marshals Service (USMS) and the Federal Bureau of Investigation (FBI) are both federal law enforcement agencies in the United States, but they have different roles and responsibilities.

The USMS is the oldest federal law enforcement agency in the country and is responsible for a wide range of law enforcement activities. The agency was established in 1789 and has since played a vital role in enforcing federal laws and protecting the federal judiciary. The USMS is the enforcement arm of the federal courts and is responsible for providing security for federal judges, ensuring the safe conduct of federal court proceedings, and apprehending fugitives who have violated federal laws.
In addition to its primary mission of providing security for the federal judiciary, the USMS also has a number of other responsibilities, including protecting witnesses in federal cases, transporting federal prisoners, and conducting investigations into various types of criminal activity. The USMS has approximately 4,000 deputy marshals and civilian employees located throughout the United States and overseas.
The FBI, on the other hand, is the primary investigative agency of the federal government and is responsible for enforcing federal laws and investigating federal crimes. The FBI was established in 1908 and has since played a crucial role in protecting the United States from various types of criminal and terrorist threats.
The FBI investigates a wide range of federal crimes, including terrorism, espionage, cybercrime, organized crime, white-collar crime, and public corruption. The agency also provides support to state and local law enforcement agencies in the form of training, intelligence, and technical assistance.
One of the key differences between the USMS and the FBI is that the USMS is primarily focused on enforcing federal court orders and apprehending fugitives, while the FBI is focused on investigating federal crimes. The USMS is also responsible for providing security for federal judges and courthouses, while the FBI does not have this responsibility.
Another key difference is that the USMS has a broader jurisdiction than the FBI. The USMS has the authority to enforce federal laws throughout the United States, while the FBI has jurisdiction only over certain types of crimes and only when they involve a federal interest or cross state lines.
Despite these differences, the USMS and the FBI often work together on joint investigations and operations. For example, both agencies played key roles in the arrest and conviction of notorious Boston mobster James “Whitey” Bulger in 2013. The USMS was responsible for capturing Bulger after he had been on the run for more than 16 years, while the FBI was responsible for investigating and prosecuting Bulger and his associates.
In conclusion, while the USMS and the FBI are both federal law enforcement agencies, they have different roles and responsibilities. The USMS is primarily responsible for enforcing federal court orders, apprehending fugitives, and providing security for federal judges and courthouses, while the FBI is responsible for investigating federal crimes and protecting the United States from various types of criminal and terrorist threats. Despite these differences, the two agencies often work together on joint investigations and operations to enforce federal laws and protect the safety and security of the American people.