A letter circulated by NIPSA
on Friday states the union has "lodged legal proceedings with the NICS seeking to halt the process due to lack of consultation".
general secretary John Corey on news that staff are behind a ballot on strike action over low pay
A walk-out is now on the cards, said one source, and the three main unions, ASU, NIPSA
and T&GWU, are considering balloting members.
protesters gathered at Broadcasting House on Ormeau Avenue as part of a growing backlash against the controversial decision announced earlier this Unite, GMB, Nipsa
and Unison offered their support.
The development came as union NIPSA
continued consulting its members on possible strike action after the same workers were offered an annual pay rise amounting to pounds 22 a year, or 1p an hour.
Negotiations between employees' union NIPSA
and museum management are under way but a union spokesman said industrial action has not been ruled out.
has hit out angrily over the lack of consultation on plans it fears will also mean the end of a number of customer-facing offices in the South and North West regions.
Workers union Nipsa
, who have described the pay offer as "wholly unacceptable", are to consult with members on strike action - a year after a bitter dispute with management in a similar row over pay and conditions.
Organised by Nipsa
, the event was held in solidarity with workers who had been threatened or had vehicles hijacked.
Little wonder then that NIPSA
has taken so many of its members onto the streets in protest at the Tory-style administration at Stormont.
general secretary Alison Millar placed full responsibility at the door of management and said more needed to be done to improve the working environment.
leaders are threatening to keep members out of work indefinitely in a move that could cripple front line services throughout Ulster.