Yet another government agency, this time a four-letter one as opposed to
three letters. Their
mission statement (from their
website) is
"to reduce loss of life and property and protect our nation's critical infrastructure from all types of hazards through a comprehensive, risk-based, emergency management program of mitigation, preparedness, response and recovery.
This organization reports only to the President of the United States, and is completely independent of the Federal government.
FEMA is most widely-known for using black helicopters during their "operations", and is the source of many conspiracy theories.