 The Soviet authorities regarded service to the prewar Polish state as a " crime against revolution " and " counter @-@ revolutionary activity " and arrested many members of the Polish intelligentsia , politicians , civil servants and academics , as well as ordinary persons suspected of posing a threat to Soviet rule . More than a million Polish citizens were deported to Siberia , many to <unk> concentration camps , for years or decades . Others died , including over 20 @,@ 000 military officers who perished in the <unk> massacres . 
