Widespread trouble flared when members of North East Frontline Patriots, Protect the Monument from Black Lives Matter and other groups, including HellsAngels and veterans, attended a Black Lives Matter demonstration in Newcastle in June 2020.
A number of officers, police dogs and horses sustained injuries, as well as a 17-year-old protester, who was taken to hospital with a head injury after she was struck by a bottle.
Footage captured on the day showed fighting and scuffles break-out between protesters and counter protesters, as well as missiles being thrown and smoke canisters let off.
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Newcastle Crown Court heard both groups stated they planned a "peaceful" protest and the counter protesters claimed they were there to protect Grey's Monument.
Police say vandals also graffitied the Monument and litter was strewn around the surrounding area.
Following the incident, a major investigation was launched with more than 200 hours of footage examined before a total of 38 people were charged with violent disorder – 34 men and two women, as well as two teenagers.
Now, 20 people have been sentenced at Newcastle Crown Court for their roles after pleading guilty to violent disorder.
Assistant Chief Constable Neil Hutchison said: “The scenes we watched unfold during this protest activity were absolutely unacceptable and have no place here in our city – a place which prides itself on being friendly and hospitable.
“I am pleased that those convicted have been brought to justice for their shameful and violent actions.
“We understand the right to lawful protest is a key part of any democracy which the police will uphold, however we will not allow them to be used as an excuse to commit crime.
“I would like to thank the officers, volunteers and police staff, as well as our partners, who formed part of this major investigation. The convictions we have seen are a testament to their hard work and dedication and I hope these results highlight to the wider public that we will not tolerate this type of behaviour.”
Those convicted and sentenced include:
Craig Hornsby, of Wordsworth Close, Hexham, jailed for 28 months
Christopher Bone, of Affleck Street, Gateshead, jailed for 29 months
Neil Drummond, of Audley Road, South Gosforth, two years imprisonment suspended for two years
Ryan Barlow, of Parklands Way, Felling, jailed for 27 months
Ronald Short, of Stockwell Green in Newcastle, jailed for 27 months
Michael O’Brien, of Beresford Gardens in Byker, jailed for 27 months
Wendy Robson, of Tauton Avenue, North Shields, jailed for 29 months
Jay Plunkett, of Lumley Walk, Dunston, jailed for 27 months
Elliott Wright, of Paxton Court in Pity Me, Durham, jailed for 27 months
Christopher Butters, of Moorland Avenue, Bedlington, jailed for 31 months
Colin Green, of Church Street, Sunderland, jailed for 29 months
Darhys Moore, of Fern Close, Prudhoe, 24 months imprisonment suspended for 12 months
Christopher Simpson, of Cedar Road, Fenham, jailed for 29 months
Christopher Wood, of Malvern Road, Washington, jailed for 28 months
Usman Ogiden, of Gerald Street, Benwell, jailed for 26 months
Philip Scorfield, of Howlett Hall Road, Newcastle. jailed for 29 months
Derek Hasse, of Ross Grove, Cramlington, jailed for 26 months
John Mann, of Acomb Crescent, Gosforth, jailed for 29 months
George Coulson, of Beechburn Walk, Newcastle, jailed for 29 months
Matthew Chapman, of Church Street East, Sunderland, jailed for 30 months