Final answer:
The main function of the FCC is to regulate communications in the United States, including radio, television, wire, satellite, and cable. They assign frequencies, allocate spectrum space, and regulate content.
Step-by-step explanation:
The main function of the FCC (Federal Communications Commission) is to regulate interstate and international communications by radio, television, wire, satellite, and cable. They are responsible for assigning frequency, power, and call signs for radio, allocating spectrum space for AM and FM radio, and designating sign-on/sign-off times and operating power for broadcast stations. The FCC also regulates material deemed indecent or illegal, some aspects of programming for children, and political campaign advertising.