Thousands of Scots public sector workers will go on strike on Thursday in a dispute over pensions.
Public facilities from job centres to the coastguard and courts will be affected as members of the PCS union walk out.
The union claims that Westminster pension reforms mean members are being asked to work longer and pay more but get less.
It alleges that public sector employees are being asked to pay almost three times as much into smaller pension funds while working up to eight years longer.
In a message of support, Unison general secretary Dave Prentis said: "I am writing to express UNISON’s full support and solidarity for your union's day of action.
"We pledge to fight and campaign alongside other public services unions to secure an acceptable outcome to the ongoing discussions with the Coalition Government on public sector pensions.
"No worker takes the decision to strike lightly and this is an important battle for us all.
"Our campaigns against Tory cuts are more crucial than ever and we look forward, through the TUC, to build and mobilise a strong, effective and high profile demonstration to show our solidarity in fighting for a fair deal for all our members."
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