 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 Gulag concentration camps , for years or decades . Others died , including over 20 @,@ 000 military officers who perished in the Katyn massacres . 
 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 <a href='uninflect' title='1'><mark>were</mark></a> deported to Siberia , many to Gulag concentration camps , for years or decades . Others died , including over 20 @,@ 000 military officers <a href='null_relcl' title='2'><mark>who</mark></a>perished in the Katyn massacres . 
The Soviet authorities regarded service to da 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 was deported to Siberia , many to Gulag concentration camps , fa years or decades . Others died , including ova 20 @,@ 000 military officers perished in tdaKatyn massacres .