The so-called Serov Instructions (full title: On the Procedure for Carrying out the Deportation of Anti-Soviet Elements from Lithuania, Latvia, and Estonia) was an undated top secret document, signed by General Ivan Serov, Deputy People's Commissar for State Security of the Soviet Union (NKGB). The instructions detailed procedures on how to carry out the mass deportations to Siberia of June 13–14, 1941, which occurred throughout the Baltic States during the first Soviet occupation, in 1940–1941.