The election result should give a sharp warning to the government that it is time to listen to the concerns of working people, according to the RMT transport union.
RMT general secretary Bob Crow said the only legitimate war the government should engage in is a war on poverty.
"Britain has clearly shown that it doesn't want a Tory government, but the huge dent in Labour's majority and the huge number of voters staying at home show that Britain doesn't want a Labour government pursuing Tory policies either," Crow said.
"The time has come not just to listen to but to act on the concerns of working people," he said.
The RMT also called for action "to end attacks on pension rights" and to "bring Britain's labour legislation back on the right side of international law".