Cotu has threatened to pull out of an agreement with the national health insurer if there is a change of management at the scheme.
The threat comes a day after the umbrella trade union group agreed to allow its members to contribute to the National Hospital Insurance Fund after a proposal that this should be pegged on basic, not gross pay.
Cotu Secretary-General Francis Atwoli said there have been attempts to destabilise reforms at the NHIF through change of management and workers had entrusted this process to the chairman of the board and chief executive Simon Ole Kirgotty.
He said Cotu will not allow corruption cartels to loot workers’ contributions through any planned changes to management at the fund. He said they would no want Mr Kirgotty out of the board.