The leader of the far right English Defense League has been convicted of assault after head butting a rival during a rally earlier this year.
Police officers had testified that 28-year-old Stephen Lennon attacked 33-year-old Alan McKee following a confrontation in the northern English city of Blackburn on April 2.
Lennon and McKee deny that the incident took place, with McKee saying he believes someone else assaulted him and Lennon accusing police of fabricating evidence.
District Judge Peter Ward said Thursday that he believed the police account and warned Lennon that he could face prison when he's sentenced in November.
The English Defense League casts itself as a peaceful opponent of radical Islam, but its protests have often turned violent.