Polish authorities arrested the man who hung a banner that read "We will take Lviv back and kill Bandera followers" during a rugby match between Poland and Ukraine, Radio Poland reported.
Now he faces imprisonment of up to two years according to the Polish criminal code.
The provocative banner appeared on the stadium's grandstand last Saturday before the eyes of the town's deputy mayor. Security guards feared to take it down due to the fans' aggressive attitude.
Finally, it was dismantled by five intrepid girls.
Stepan Bandera was a Ukrainian nationalist of World War II whose movement is blamed by Warsaw for multiple atrocities including ethnic cleansing and genocide.