For 16 years Putin worked as an officer in the KGB (the Committee for State Security), spying for the secret police agency in East Germany between 1975 and 1991. Putin's primary job was to recruit foreigners in Dresden in the hope of sending them as undercover agents to the USA. While the Berlin Wall was falling in 1989, Putin even burned KGB files as a mob tried to enter the agency's headquarters in Dresden. He moved back to Russia in 1991 and left the agency with the rank of lieutenant colonel.