A man was fined £80 for throwing a firework in the street during a march by the EDL in Nottingham on August 6.
Jack Stevens, 26, pleaded guilty when he appeared before magistrates in the city on Tuesday. He was ordered to pay £85 prosecution costs.
The charge was bought under the 1837 Town Police Clauses Act and said that “on King Street he wantonly threw a firework to the obstruction, annoyance or danger of residents”.
A government surcharge of £30 was ordered from Stevens whose address was given in court papers as Oxford Street, Long Eaton.
Officers were drafted in from Greater Manchester, Durham and Lancashire, as well as forces closer to home like Leicestershire and Lincolnshire, to tackle the protest and counter protest by anti-fascist groups.
Businesses said they lost out on thousands of pounds as a result of the disruption, a wedding was moved from the council house and the beach in Old Market Square was temporarily closed.
Police made five arrests but thanked the public for helping them to bring the protests to a peaceful conclusion.