More than 20,000 joined a rally in Edinburgh to oppose the spending review announced by the Con Dem coalition on Wednesday.
Union leaders warned of strike action over the slashing of public services, which will see Scotland lose around £3billion over the next four years.
Up to 50,000 of the 500,000 public service jobs under threat will be lost in Scotland and the same number could go in the private sector.
The Scottish Trades Union Congress organised the rally and general secretary Grahame Smith said: "If members decide that the best way is to take industrial action then they will do that. I'm not saying that as a threat, but as a fact.
"We want to work constructively with employers but if they are not willing to do that then members will take action to protect their rights."
Full story at Sunday Mail website
More UNISON pics and story to follow here on this blog and on UNISON Scotland website.