Which organization regulates all radio communication in the United States?

The Federal Communications Commission (FCC) is the organization responsible for regulating all radio communication in the United States. Established in 1934, the FCC oversees various forms of communication, including radio, television, wire, satellite, and cable. It plays a critical role in managing the electromagnetic spectrum, which is essential for enabling various forms of wireless communication.

The FCC's authority allows it to allocate frequencies, manage licensing for broadcast and communication services, and establish regulations to ensure that public airwaves are used appropriately and are accessible to all. This encompasses not only commercial entities but also emergency services and public safety communications.

The National Telecommunications and Information Administration (NTIA), while also involved in communication regulation, primarily focuses on federal government communications and is concerned with the management of the federal government's use of spectrum. The Federal Bureau of Investigation (FBI) is primarily focused on law enforcement and national security, and does not regulate radio communications. Similarly, the Department of Homeland Security (DHS) is tasked with safeguarding the nation from threats but does not have regulatory authority over radio communications. Thus, the FCC is the correct organization that regulates all radio communication in the U.S.