A third union has voted to take industrial action at East Dunbartonshire Council over proposed changes to terms and conditions including cuts in holiday entitlement.
Unite the Union said 91.7% of its members had voted in favour of action on a turnout of 59%, and the first in a series of one and two-day strikes will take place later this month.
Unison and the GMB union have already voted in favour of action over what they say is an attack on terms and conditions by the Liberal Democrat/Conservative-controlled council.
The council's proposals include a reduction of three days annual leave, removal of enhanced overtime rates, extension of the working day and cuts to facilities management cleaning.
Unite industrial officer Kenny Jordan said: 'Unite members at East Dunbartonshire Council have shown their resolution by strongly voting for industrial action.
'The savage cuts being proposed to terms and conditions, and making our members work harder and longer for less will not go unopposed.
'If there are efficiencies to be made, then they should be sought elsewhere and not from the hardest working and lowest paid workers who are already stretched to the brink while trying to do their very best for the people of East Dunbartonshire.'
