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Within several days of the invasion, Soviet officials were developing plans handling of Polish prisoners, including disposal of people likely to be disruptive to Soviet rule, including teachers, doctors, lawyers and other educated or "counterrevolutionary" elements. Military officers were also targeted, since a leaderless Polish military would pose no threat to the Russians.

Within several days of the invasion, Soviet officials were developing plans handling of Polish prisoners, including disposal of people likely to be disruptive to Soviet rule, including teachers, doctors, lawyers and other educated or "counterrevolutionary" elements. Military officers were also targeted, since a leaderless Polish military would pose no threat to the Russians.

In March 1940, Stalin ordered Lavrentiy Beria, head of the NKVD (Soviet Secret Police) to execute approximately 20,000 Polish captives. <ref>http://rt.com/Russia_Now/Russiapedia/Those_Russians/blavrentiy-beria.html</ref>

In March 1940, Stalin ordered Lavrentiy Beria, head of the NKVD (Soviet Secret Police) to execute approximately 20,000 Polish captives.<ref>http://rt.com/Russia_Now/Russiapedia/Those_Russians/blavrentiy-beria.html</ref>