Providing public safety and enforcing laws require more than one agency. Although lawmakers have created specific law enforcement organizations for different jurisdictions and offenses, criminal investigations and those responsible for conducting them are not always easily delineated. In those cases, agencies often work together as they protect the country and its citizens. This entry describes several U.S. law enforcement agencies by providing a brief organizational history including key figures, presenting the agency’s current responsibilities, and describing typical work opportunities including qualifications necessary for employment.