IrishMaverick, i am not sure what the situation is but i suggest you have small room in the restaurant where you can bring anyone who is looking for protection money. Have the room decorated in a few 'select' irisih nationalist decorations and point out to anyone that you have friends in places that will quite happily look after you should anyone give you hassle.
One suspicion that i have had is that a lot of the security firms might be disguised protection gangs, but this is based on absolutely nothing apart from mere suspicions.
Not sure about Wroclaw but it does exist and sometimes there in uniform better off employing them as thats the easiest way out hassle free. If you have a polish friend they will tell you what to do.