Bosses have locked out construction workers building a £500 million gas plant on Shetland.
The GMB union said contractors Petrofac barred the 47 workers from the site after the union served notice of a strike ballot.
Workers want £50 per day to compensate for the failure to provide suitable accommodation.
They also want an additional payment for lengthy travelling time undertaken each day.
Some workers employed by other contractors, including Balfour Beatty, are involved in the same dispute.
They will also be balloted for strikes.
The first hearing in an anti-blacklisting High Court claim took place last week.
Nearly 100 claimants supported by the Blacklist Support Group are suing construction bosses over the blacklist.
The GMB, Unite and Ucatt have all joined the high court claim, which will be heard in April.
The companies include Sir Robert McAlpine, Balfour Beatty, BAM, Carillion, Laing, Kier Ltd, Skanska, Vinci and AMEC.
Barrister Hugh Tomlinson called the Consulting Association “a blacklist for trade union and political activities” and accused firms of being involved in “a conspiracy to injure”.