Finks bikie has been jailed for five months for assaulting a police officer who tried to stop a fight. Dylan Jessen, 22, pleaded guilty in Adelaide Magistrates Court to aggravated assault on a police officer and to hindering police. It stemmed from an incident at the rear of the Dublin Hotel at Glenelg last May. Police had been called to break up a fight involving Jessen and he turned and punched an officer who had grabbed him from behind. Chief Magistrate Elizabeth Bolton said Jessen then punched the officer again and wrestled with another officer, then ran off. The court heard Jessen had a history of violence, including a conviction over a brawl involving rival gangs in Hindley Street in the city. Jessen will be eligible for release from prison in August.