The Alliance Party has condemned reports that loyalists are to resume their weekly picket at the Catholic Church at Harryville in Ballymena, Co Antrim.
Loyalist sources said they expected about 200 people and at least one band to attend the protest this Saturday night.
The RUC is declining to comment on the reports. A spokesman for the Parades Commission had no record of an application for a parade. However, it is understood that if just one band turned up and played at one spot, the gathering would not be considered a parade and would fall under public order legislation.
The first Harryville protest began in September 1996 and lasted nearly two years. It is estimated to have cost £2 million to police.
Alliance councillor Ms Jayne Dunlop said: "I express my regret that the resumption of the protest at Harryville is being considered. The previous protest gained nothing apart from inconveniencing the lives of the parishioners at Our Lady's and causing distress and intimidation.
"There is no just cause for this protest. If it resumes it will be nothing but a festering sore in Ballymena. I hope those behind the proposed protest will reconsider their actions."
The original protest began after the banning of an Apprentice Boys parade in neighbouring Dunloy. Loyalist sources said the new protest was being organised in frustration at interference in parades.