The Labour Party says there needs to be a probe into the Public Service Commission posting ads about Thursday's mega-strike.
About 100,000 workers in health and education are set to walk off the job later this week.
Several commission adverts have appeared on social media - outlining how it'll disrupt services.
PSA National Secretary Fleur Fitzsimons says the Commission is running political lines espoused by the Government.
"What they are doing is attempting to position themselves favourably with the public when it comes to a collective bargaining matter that is subject to good faith."
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