Independent Agencies are created by Congress to perform specialized jobs such as the CIA, CSPC, NASA, FCC, and FBI.
There are approximately 65 independent agencies under the US government.
Regulatory Agencies are a type of independent agency that has the power to make rules and bring violators to court, examples include the FDA, SEC, EPA, and CDC.
The Federal Bureaucracy consists of department and agencies at all levels of government, employing over 3 million people.