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“Would you explain why a Homeland Security was deemed necessary when we already have the FBI, CIA, NSA, State Police, Local Police, Sheriff, Coast Guard, ATF, and probably even more such agencies?”

I remember when Bush started Homeland Security. All the agencies you listed were on their own and information was not being shared. Homeland Security was created as a hub where all information from the various agencies was collected and shared. Eventually, the key organizations below were added to Homeland Security to administer:

Key Organizations, A-Z
•Computer Emergency Readiness Team (US CERT)
•Domestic Nuclear Detection Office
•Federal Emergency Management Agency (FEMA)
•Federal Law Enforcement Training Center
•Management Under Secretary
•Operations Coordination Office
•Policy Office
•Preparedness Directorate
•Science and Technology Directorate
•Transportation Security Administration
•U.S. Citizenship and Immigration Services
•U.S. Coast Guard
•U.S. Customs and Border Protection
•U.S. Immigration and Customs Enforcement
•U.S. Secret Service