FBI agents investigate high-profile crimes, conduct surveillance and undercover operations, and protect the U.S. from domestic and foreign threats. The job requires a bachelor's degree, U.S. citizenship, and age between 23-36. Agents must go through rigorous training at the FBI academy and colleges. While the work is dangerous and involves long hours and travel, FBI agents start at a salary of $41,000-$55,000 that can increase up to $104,000.