Delegates at the union's annual conference in Bournemouth will consider an emergency motion on the subject this afternoon.
It also condemns the government's intention to proceed with reorganisation in Cleveland on 1 April 1995 without allowing local elections to be held.
'This denial of civil rights and unworkable timetable is the culmination of a local government review which has now been totally discredited,' the motion reads.
The conference notes there is 'evidence that the reorganisation process is leading to a speeding up of privatisation pressures including the selling off of DSOs'.
Meanwhile, the Association of County Councils has greeted the motion as a 'highly significant shift in Unison policy'.
According to an ACC spokeswoman, 'it is an indication of the growing concern over the impact of the review. It is almost certain to have an effect on the attitude of other unions.'