Union members at Pembrokeshire County Hall are to protest outside County Hall about the "catalogue of failures and concerns" under the leadership of council chief executive Bryn Parry-Jones.
They are also to ballot members for a vote of no confidence in Mr Parry-Jones.
In a press statement issued a short time ago, union members said: "The pension pay supplements paid to Bryn Parry Jones, Pembrokeshire County Council’s CEO, which are being reinvestigated by Gloucester Police force, is a step too far for his employees.
"At a joint trade union meeting UNISON, Unite and GMB decided to ballot their members for a vote of no confidence in their most senior officer."
Vic Dennis, UNISON Branch Secretary, said: “UNISON members are astonished that somebody entangled in this whole sorry saga has not been suspended whilst the investigation and now reinvestigation takes place.
“If this happened to an ordinary worker their feet would not touch the ground. They would be suspended to allow a full investigation to be carried out.”
“Our members are saying 'enough is enough'. There has been a catalogue of failures and concerns. The most recent BBC Week In Week Out programme highlighted further failings that took place whilst the Chief Executive was in charge.
“The Chief Executive has refused to repay any of the £45,000 pounds of pension payments he received directly to his bank account.
"In the meantime some of the lowest paid and hardest hit by the pay and grading review are suffering hardship whilst the appeals process drags on with no end in sight.”
“The joint unions are now planning to demonstrate their anger at a lunchtime protest on 8 August, similar to the action taken by employees of Caerphilly Council which highlighted the failings of their CEO.”