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The Federal Security Service of the Russian Federation (FSB; Russian: Федеральная служба безопасности Российской Федерации (ФСБ), is the principal security agency of Russia and the main successor agency to the USSR's KGB. Its main responsibilities are within the country and include counter-intelligence, internal and border security, counter-terrorism, and surveillance as well as investigating some other types of grave crimes and federal law violations. It is headquartered in Lubyanka Square, Moscow's center, in the main building of the former KGB. According to the 1995 Federal Law "On the Federal Security Service", direction of the FSB is executed by the President of Russia, who appoints the Director of the FSB.
Under Russian federal law, the FSB is a military service just like the armed forces, the MVD, the FSO, the SVR, the FSKN, Main Directorate for Drugs Control, and EMERCOM's civil defense, but its commissioned officers do not usually wear military uniforms.
The FSB is mainly responsible for the internal security of the Russian state, counterintelligence, and the fight against organized crime, terrorism, and drug smuggling.
Several members of the organization appear throughout the Ryanverse.