The union leader has told Sky News a dispute threatening 1,400 jobs is a battle for the future of skilled manufacturing in Scotland.
GMB union Scotland secretary Gary Smith made his comments after hundreds of workers at Burntisland Fabrications descended on the Scottish Parliament to demand help.
The engineering firm, known as BiFab for short, has filed a notice of intention to appoint administrators as it faces a critical cash position linked to ongoing contracts.
The main issue is a payments dispute between BiFab and Dutch-owned contractor, Seaway Heavy Lifting (SHL), on a windfarm project for a consortium led by energy firm SSE.
Video: ‘These type of jobs need to be preserved’
SHL has denied allegations it has failed to pay BiFab for completed work.
A spokesman counter-claimed it had suffered from cost over-runs and production problems.
BiFab staff at Burntisland and Methil in Fife and Arnish on the Isle of Lewis have voted to continue working until further notice in the knowledge they risk not getting paid unless the row is resolved.
The union has even refused to allow elements of its members’ work to leave the sites for fear SHL will try and get it completed elsewhere.
Mr Smith told Sky’s Ian King Live the Scottish and UK governments should intervene to resolve the dispute as it risked becoming a broader battle for skilled work in Scotland.
He said: “Our members are working on the renewables industry and we were told that windfarms and the renewables sector were the jobs of the future.
“So we’re doing the right thing getting that type of work in at the yards and then because of corporate misbehaviour and because of corporate politicking our members livelihoods are being put at risk.”
Scottish Economy Secretary Keith Brown told the workers’ rally: “The priorities expressed to me by the trade unions are the same ones that we have – to continue BiFab, to make sure the workers are paid in the meantime whilst we sort out the longer term future, and to secure that long term future beyond the contract at the centre of this dispute.
“What I will say of the people we’ve spoken to – there’s a general recognition of the excellence of the workforce and the skills that are in that workforce.
“That is the strongest card we have to play in the negotiations and discussions that we have. We are absolutely committed to this.”