I'd have to say that there is no such thing as a 'Polish mafia', if you mean a mafia in the mold of Casa Nostra, Cammora, Vory z Zakone or the Jewish mafia, then no, the closest thing in Poland to those criminal organizations would have to be the government in Poland.
what's their names?
Tomek , Piotre , and a really dodgy guy named Jan....
I hate to admit it, but he answered your question.
My gf has pointed out some Mafia types in Krakow. Seemingly they control all the begging rackets in the city