Which agency regulates and enforces the rules for the Amateur Radio Service in the United States?

The Federal Communications Commission (FCC) is the independent United States government agency responsible for regulating interstate and international communications by radio, television, wire, satellite, and cable. This makes them the sole regulatory body for the Amateur Radio Service within the US. While the ARRL (American Radio Relay League) is a prominent national association that advocates for amateur radio and provides resources, it has no regulatory or enforcement authority. Similarly, the Department of Homeland Security manages national security and emergency response but does not regulate amateur radio rules.