in this post, Serov was also responsible for the co-ordination of deportation from the Baltic States and Poland. He was one of the top ranked officials responsible for the Katyn massacre of Polish officer POWs. Deputy Commissar of the NKVD In 1941, Serov was promoted to become Deputy Commissar of the NKVD as a whole, serving under Beria as one of his primary lieutenants; in this function, Serov was responsible for the deportation of a variety of Caucasian peoples. He issued the so-called Serov Instructions, which detailed procedures for mass deportations from the Baltic States (For some time confused with the NKVD Order No. 001223 by historians.). He also coordinated the mass expulsion of Crimean Tatars from the Crimean ASSR at the end of World War II. Viktor Suvorov claims that in 1946, Serov personally took part in the execution of Andrey Vlasov, along with the rest of the command of the Russian Liberation Army, an organization that had co-operated with the Nazis in World War II. Serov was one of the senior figures in SMERSH, the wartime counterintelligence department of the Red Army, Navy and NKVD troops, a deputy to Viktor Abakumov. It was in this function that Serov established the Polish Ministry of Public Security, the Polish secret police until 1956, acting as its main Soviet adviser and organizer. Serov organized the persecution of the Armia Krajowa as Deputy Commissar, helping to bring about the Stalinist era of Polish history. Postwar In 1945, Serov was transferred to the 2nd Belorussian Front and went to Berlin in May that year. He stayed there until 1947 and helped to organise the building of the Stasi, the East German secret police. Serov was also there to monitor and spy on Marshall Zhukov, while acting as his political advisor. Chairman of KGB After the death of Stalin, Serov, who had Beria's trust, betrayed him. He conspired with the officers of GRU against Beria to avoid his own downfall. Serov was one of the few senior members of the political police to survive the incident. In 1954, Serov became Chairman of the KGB and so was the head of the greater part of the Soviet secret police. Serov organized security for the tours of Nikolai Bulganin and Nikita Khrushchev in Britain and he was decried by the British media as "Ivan the Terrible" and "the Butcher". Hungary Serov played a key role in