Millions of people around the world know about the Katyn massacre, the execution of 22,000 Poles captured in the Soviet-Nazi invasion of Poland.
Soviet history
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Eduard Andryushchenko: The KGB massacred thousands of Poles in 1940 Kharkiv
A perosn waves a Polish flag at the Monument dedicated to Polish officers, murdered in the 1940 Soviet-era Katyn massacre, in Kharkiv on Sept. 25, 2010.