Union boss Len McCluskey has blamed Scottish Labour for the party's defeat across the UK.
The Unite Union general secretary said leader Jim Murphy should resign as a result.
"I lay the blame for that very squarely at the feet of Scottish Labour," he said 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."
Calling for Mr 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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