The Lubyanka has only recently shed some of its historically sinister character. The building was taken over by the Bolsheviks in 1918, and soon afterward began its long role as the headquarters of the notorious Soviet secret police. First known as the NKVD and later as the KGB, the secret police for decades used this building not only as an administrative headquarters but also as an interrogation center and temporary prison. Today it is home to the FSK, the Russian domestic intelligence service.