Another trade union has announced its support for Neil Findlay in his bid to become leader of the Scottish Labour Party.
The GMB said it was backing the MSP, and supporting MP Katy Clark for deputy leader.
Harry Donaldson, GMB Scotland Regional Secretary said: "After having gone through a thorough process in which all candidates for the Leader and Deputy Leader were interviewed, the lay member-led Scottish Regional Committee decided to support Neil Findlay and Katy Clark for leader and deputy leader.
"The view of the committee following a lengthy debate was that it was time for change and that Labour had to return to its roots and regain its Socialist values."
Mr Findlay is one of three candidates seeking to take over the job from Johann Lamont, who stood down suddenly last month.
As she announced her decision, Ms Lamont, who had been leader since 2011, hit out at Labour colleagues in Westminster, accusing them of treating Scotland like a "branch office".
Mr Findlay has already won the support of a number of trade unions including Unison and Unite, while fellow MSP and former Scottish minister Sarah Boyack has also put herself forward for the job, as well as former Scottish secretary Jim Murphy.
Nominations for the post have closed, with the new leader due to be announced on December 13. The contest will be decided by a vote involving Labour parliamentarians in Scotland, members of the party north of the border and affiliated trade unions and societies.
Mr Murphy is a member of the GMB union.
Pat Rafferty, Unite Scotland's leader, commented: "The choice for leader of Labour in Scotland has never been clearer. It is between genuine change - or more of what has seen voters turn their backs on Labour.
"Neil Findlay's programme is one of substance. Solid commitments on jobs, decent wages, homes and education - these are what will bring hope back to people and renew faith in Scottish Labour.
"He has his roots firmly planted in our workplaces, our communities. He knows about the struggles ordinary people face because he has been there. He knows about their hopes for a better life because he has them too. He is the man to turn around the failing fortunes of Labour in Scotland and lead out country to fairer future."
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