What ever ideology they may have professed at the time, it was at best secondary, and likely a ruse, used to advance the greater cause of Polish independence. Once independent the Polish people have moved steadily to the right, electing the PIS party today.
What ever their nominal philosophy they embraced, or pretended to embrace to gain the confidence of their Russian occupiers, they, as a group, did more to destroy oppressive leftism and restore Freedom than almost any American group I can think of in the recent era. That would include the GOP after Reagan, or perhaps Bush 1, although he was extremely and unnecessarily conciliatory towards the USSR at the crucial moment of their failure.
I did support the goals of Soladarnosc at the time, and am still proud of it. Damn glad the commies are gone out of Poland, wonder how the hell we get them out of the USA.