Union officials said the Government was planning to attack hours, holidays, sick pay and flexible arrangements under a review of working conditions announced last year.
PCS general secretary Mark Serwotka said the lives of civil and public servants were being made more difficult by cuts.
The Government is facing a fresh strike by civil servants after a union announced it is balloting 250,000 of its members in a row over pay, pensions and working conditions.
The Public and Commercial Services union (PCS) warned of a series of walkouts across England, Wales and Scotland, adding that it would seek support from other unions about co-ordinated action.
Voting will start on February 8 and close on March 4, raising the threat of pre-Easter stoppages.
250,000 civil servants are to be balloted on strikes over pay, pensions and working conditions, said the PCS union.