FCC stands for Federal Communications Commission. It is an agency of the U.S. Federal Government responsible for the management of the radio spectrum in the US. The FCC protects against "radio and broadcast pollution", both by enforcing standards of broadcast decency, and by regulating electromagnetic noise sources.
Electrical and electronic products may interfere by producing radio spectrum noise. As electric current moves around inside an electrical product, the current will produce electromagnetic field waves that will travel through space. Those waves may affect other electrical currents in other products, and cause unwanted interference.