soratothamax wrote:FBI probably don't know about the CIA because many of the CIA agents are not continuous. They are selected among police officers or FBI to investigate, depending on skill and knowledge. FBI is like the National police, so they are set in the job. CIA is not really a "set" people. It can be a new person everytime doing the investigating.
This. The FBI is essentially the US Federal Government's police force. US States and counties have their own individual police forces: they do not work for the federal government, but the local or state governments.
US Federal Govenment has Enumerated Powers and Implied Powers. The states have Reserved powers.
Following the court case of McCulloch v. Maryland (1819), constitutional amendments after the Civil War, as well as the overall result of the war, final dictating power is given to the federal government, making it more powerful, absolute, or whatever than state governments.
--Thus, makes the FBI, the federal police agency, the most powerful police agency in the United States, and the one used for international situations. It is an overt agency, though just like any police department, will have causes for undercover covert work, and more so due to broader scope of FBI.
The CIA is a spy agency, meaning, they are made to be covert. CIA operatives may work domestically or internationally, but in any case, they work intelligence or counter-intelligence operations, meaning, they live under an assumed identity. This is where the governmental stealth and subterfuge come into play: black ops groups most likely are done with CIA personnel. Think James Bond, Jason Bourne, Michael Weston for popular and contemporary entertainment examples, taken to the extremes. Most do not live like them.
Or simple example:
Wikileaks of US Citizen: Not good, identity theft incoming.
Wikileaks of FBI agent: Bad for agent
Wikileaks of CIA agent: Deadly to agent