Up to 2,000 gardai, nurses and prison officers are to take part in a rally in Dublin this evening against pay cuts.
The members of the 24/7 Alliance of unions are threatening industrial action if premium pay and allowances are reduced.
Unions representing lower paid civil servants are being briefed on plans to cut the sector pay bill by €120 million.
The government is seeking to make the savings over the next 3 years as part of an extension of the Croke Park deal.
Changes 'fraught with difficulty'
The Civil Public and Services Union (CPSU) says plans for additional hours or changes to flexitime would be fraught with difficulty.
Meanwhile the civil service is the focus of talks today on extending the Croke Park Agreement on public sector pay.
The rally will take place in the National Basketball Arena in Tallaght in Dublin this evening.
The GRA and the AGSI has already pulled out of the talks process.
The garda body says rank and file officers will be withdrawing goodwill gestures from next Friday - by not using their own cars or phones for duty.
The CPSU General-Secretary Eoin Ronayne says his members have no more to give after previous pay cuts of up to 14%.
Sinn Fein Social Protection spokesperson is Aengus O'Snodaigh.
He says frontline workers should not be the focus of the government, and that the rally has his full support.
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