Sinn Féin workers in Leinster House took a principled decision not to pass the picket lines during yesterday's industrial action.
The staff, including elected representatives, said it would be hypocritical to argue in support of the workers on strike while passing the CPSU pickets.
Thousands of workers were on strike yesterday, and there pickets at many workplaces.
Government buildings remained open. Members of the Defence Forces were put to work in Leinster House in place of the ushers, who were on strike.
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Sinn Féin supports striking workers