Solidarity in Poland had many w/ Communist and socialist ideologies and backgrounds.
In the archives from a few yrs. ago I made a long post on specific currents and individuals in Solidarity, from Jacek Kuron, Karoil Modzelewski and Adam Michnik, to pick the three most prominant intellectuals in the movement.
See Kuron and Modzelewski's, neo-marxist analysis of Polish Communism published in the mid-60's that Euro-Trotskyists (Mandelites) and Third Campists here (New Politics, first round), reprinted.
See Daniel Singer's book on Solidarity for Monthly Review Press. First chapter on Solzhenitsyn, Chris.
Michael Pugliese