Lech in Poznań
Can't talk for elsewhere, but Lech are very proactive with stamping out hooliganism - every single person in the stadium needs to have a PESEL associated with their seat, and ID documents are checked against the PESEL on the ticket at the time of entry.
The system pretty much ensures that anyone causing trouble is identified and banned without much delay. I'm of the opinion that every single game in the top two leagues in Poland should have the same system.