You mean the Soviet soldiers that invaded Poland in 1939, killed 20,000 of its politicians, lawyers, doctors, scientists, artists, clergy, etc, then rolled through again 4 years later only to stay as a way to prop up the communist regime for the next 45 years?
I assure you, "Polish nazis" are not the only ones who have a problem with what Soviet soldiers and officers did, nor do we care for the hundreds of such monuments spread all over Poland.