Department of defense
The National Security Agency.
UNESCO
The Department of Homeland Security is a US Cabinet Department that coordinates between the various policing agencies in the USA (FBI, ATF, etc.) and the CIA. The National Security Agency is an executive agency that maintains the US Cyberdefense and, increasingly, spying on Internet Activities.
The department that primarily protects us from terrorism is the Department of Homeland Security (DHS). Within the DHS, agencies such as the Federal Bureau of Investigation (FBI), the Transportation Security Administration (TSA), and the United States Coast Guard (USCG) work together to prevent and respond to terrorist threats.
They are. The TSA is a government funded agency.
National Security Council.
Federal Security Agency was created in 1939.
National Security Agency (NSA)
What Federal Agency regulates ADT Security
National Agency for Computer Security was created in 2004.
Defense Security Cooperation Agency was created in 1961.
This question may pertain to some other country/nation. (in the US) There is no agency charged with "political" security.