Which were starved to death by Polish authorities in the concentration camps :-(((
en.wikipedia.org/wiki/Camps_for_Polish_prisoners_and_internees_in_Soviet_Union_and_Lithuania_(1919-1921)
About 20,000 out of about 51,000 Polish POWS died in Soviet and Lithuanian camps. Similar number of Soviet POWs - from 16,000 to 20,000 out of 80,000 - perished due to disease and poor conditions in Polish camps in that period.
Gee, I wonder in which camps conditions were worse...