Workers at the Scottish government-owned CalMac ferry company struck on Friday of last week, severely affecting Clyde and Hebrides ferry services.
The RMT union members are fighting threats to jobs, pensions and working conditions. The TSSA union is set to begin a strike ballot on Friday of this week.
Workers fear CalMac could be handed to vulture firm Serco. The Scottish National Party (SNP) government is tendering for a bumper eight-year £1 billion contract.
The RMT appealed to the SNP to make the workers’ demands a condition of the contract.
Workers want no compulsory redundancies, no changes to terms and conditions without agreement, and their pensions protected.
The party’s trade union group said it “recognises” RMT members’ right to strike and their concerns”. But it too hid behind EU procurement laws rather than criticise the attack on workers.