Right2Water, an umbrella group opposed to water charges and backed by five trade unions, has urged a spectacular and peaceful turnout for a national demonstration in Dublin on December 10.
Spokesman Brendan Ogle, of Mandate, said anyone intent on causing trouble should stay away.
“If there are a very small number of individuals – and that’s all it would be - who do not believe they can restrain themselves to peaceful protest they should stay away,” he said.
Referring to increasingly heated demonstrations over recent days targeting several leading government figures, who have claimed thuggish and sinister elements are involved, Mr Ogle said some of the incidents were serious but overall they were negligible.
“Anything other than peaceful protest will damage this campaign,” he added.
Right2Water is backed by Unite, Mandate, the Civil Public and Services Union, the Communications Workers’ Union and Opatsi, the plasterers union of Ireland.