“Entry forbidden to Jews, Commies, and all thieves and traitors of Poland.”

That was the anti-Semitic message hung outside a hostel in Cesarzowice, Polish media reported earlier today.

The town of Cesarzowice is just outside Wroclaw, a major city, which received a lot of attention for a high-profile anti-Semitic incident in November 2015. A leader of the extremist National Radical Camp, Piotr Rybak, burned an effigy of a Jew at an anti-immigrant demonstration in one of Wroclaw’s main squares.

The National Radical Camp was one of the co-organizers and leaders of a 60,000 person march on Nov. 11, Poland’s Independence Day, which included banners that read “White Europe” and “Clean Blood." The National Radical Camp is a direct descendant of a Polish anti-Semitic political movement of the 1930s, which uses the same green flag and symbols and wants an ethnically and religiously homogeneous Poland.

All of these stories may be related. According to another Polish report, Piotr Rybak is the owner of the “Dom Polski” hostel in Cesarzowice.

Rybak isn’t at the hostel, though. He’s in prison. After multiple appeals, his punishment for incitement of hatred for the November 2015 effigy-burning was reduced last month to partial house arrest of three months with a requirement of good behavior. During a smaller Independence Day march in Wroclaw, Rybak and infamous anti-Semitic priest, Jacek Międlar, were seen shouting anti-Semitic slogans and a judge ordered Rybak arrested the next day.

ADL is urging Polish authorities to investigate the illegal and anti-Semitic banner at the hostel and take appropriate action against those responsible.