Of course they did. In the run of their atrocities, this was a day’s light work:
Polish investigators say communist authorities fabricated documents that suggested Lech Walesa was a communist collaborator, to try to stop the Solidarity founder being awarded Nobel Peace Prize.
It says everything one would ever need to know that even the regime understood that nothing could ruin a reputation so quickly as being suspected of collaboration with the regime.
Via WQOW.