Far right demonstrators could be vastly outnumbered by counter-protesters when they march through Perth city centre next month.
The extremist Scottish Defence League has organised a gathering to protest against plans for a new £1 million mosque.
The demonstration, which was announced on social media, has been condemned by local politicians from all sides.
Now 13 anti-fascist groups are mobilising to block the march.
Members met in Perth at the weekend to organise a “peaceful demonstration” at the railway station, the SDL’s arranged “muster point”.
A spokeswoman for the counter-protest said: “The more people of Perthshire who can come along and add their voices against this blatant display of hatred the better.
“People at the meeting expressed their total opposition and disgust to any move the far right organisation have taken to march through the city.”
SDL members are expected to face representatives from United Against Fascism, Hope Not Hate, Dundee People’s Assembly and Stand Up to Racism, amongst others.
Chief Inspector Ian Scott, area commander for Perth and Kinross, assured there would be a large police presence on the day.
Although he was unable to say how many protesters were expected, the estimated numbers given by SDL “are not big”.
“But there will be a sizeable number from the anti-fascist side,” he said. “We want it to go off peacefully.”
CI Scott conceded there was “potential” for disorder.
He added: “People have the right to protest whether you agree with their point of view or not. And likewise, people have the freedom in this country to counter that.
“For ourselves, we look to maximise the safety of all those protesting and the general public.”
Anti-fascist groups will be holding public meetings ahead of the planned demo on Sunday, September 10.
Demonstrators are expected to gather at the train station at 1pm.
According to the SDL’s message on Facebook “local residents are furious that their objections (to the mosque) have been ignored”.
Planning officers received five objections to the Perth Islamic Society’s proposal. Opponents said they had no problem with the plan in principal, but were concerned about limited parking.
In response to calls for a counter-demonstration, a spokesman for the far-right group posted on social media: “The SDL has been active for eight years now and had over 30 demos and not even once have these left wing extremist cowards “smashed” us, they have never stopped us having a demo and they never will. The pathetic, weak traitors certainly won’t smash us in Perth.”
