They are doing so to protest educational, medical and mass media reforms.
For me the last drop was the PiS gov's removal of a progressive Polish cultural envoy in Berlin due to the her cultural institute "too much Jewish-themed content".
I feel we owe this to irrelevancy of the PiS leader Jaroslaw Kaczynski http://homment.com/the-dead-can-only-dream-about-peace

Yeah, I saw some of the vids...

" You will see today's news on January 10th, "  or whatever the Government-spokesperson said.  So they can say they're not officially 'censoring' the news. 

What an idiot.

Then the PiS Party moved Parliament to some other 'room' in the building, leaving the rotunda totally empty.  Can't have the People's Representatives distracted by the People's grievances.