Hundreds of workers building the HMS Prince of Wales aircraft carrier in Rosyth held an unofficial strike on Monday.
The action at the dockyard saw electricians down tools over a blacklisting row.
They were protesting over the treatment of a 67 year old worker fired by a sub-contractor after a dispute with a manager.
One worker told Socialist Worker, “We cabined up and the issue is about the employers not allowing someone onto the site.
“It’s been ongoing for a while. Hundreds have taken action and say they won’t stop till this is resolved.”
Two ships, costing more than £6 billion, are being delivered by the Aircraft Carrier Alliance.
This is a partnership between BAE Systems, Thales UK, Babcock and the Ministry of Defence.
Babcock has told the workers it would investigate the incident and the sub contractor.
The workers postponed a rally intended for Tuesday.
But they plan to walk out again next Monday over the sacking.
One worker said, “The job isn’t that far from finished, all the way along management have been pushing their luck and the lads are fed up. If there’s no agreement next week we’ll be back out.”