Union boss Len McCluskey has blamed Jim Murphy for Labour's election defeat at the hands of the Tories.
The Unite union general secretary said the Scottish Labour leader should quit as a result.
He said he lay the blame for the election defeat "very squarely at the feet of Scottish Labour", in an interview with BBC Newsnight.
"Not only have they lost Scotland but I think they've been responsible for making certain that the Tories were back in power in Westminster," he said.
Calling for Jim Murphy to resign he continued: "In Scotland my view is very, very strongly that we have to say to the Scottish people we're sorry for letting you down, for making you feel abandoned, and Scottish Labour is under new management."
"I think Jim and his colleagues should just leave the scene."
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