Anarcho-syndicalists. Communists. Scottish Nationalists. Anti-racism campaigners. Trades unionists.
BBC Scotland news website
It was an eclectic mix which wound its merry way from Cowcaddens to Glasgow's George Square.
There was something of a carnival atmosphere despite the rain and the city centre's usual Saturday traffic chaos.
Placards and flags of various hues were the order of the day.
An eclectic crowd gave a display of public grumpiness over Trident
It appeared that Scotland's chattering classes had shelved their differences for the day.
Trident, the nuclear missile system which is carried by submarines based in a sea loch 30 miles up the road, was undoubtedly the enemy as thousands descended on the centre of the city.
The prime minister recently outlined plans to spend up to £20bn on a new generation of submarines for Trident missiles.
One protester, 29-year-old Arwen McConnell, said: "It's time we stopped throwing money away on an obsolete and destructive weapon.
"We are totally against nuclear weapons in all of their guises."
In the civic square in which it is said Lenin once hoped revolution would spring eternal, it was less class war than public grumpiness.
A mild-mannered crowd seemed happy to make the point and drift home.
Susan Galloway, 41, secretary of the Communist Party of Britain, from Fife, said: "I'm really pleased with the breadth of participation in today's events.
"It shows that campaigns like Scotland for Peace have really paid off and CND activity is seeing a real resurgence."