If these funds are for defined benefit pensions, the state can take them. If they are defined contribution pensions, it should be hands off.
Basically, regardless of how well or badly the pension funds were invested, the state is on the hook to pay pensions in a defined benefit plan. The state gets to keep the surplus or is responsible for the deficit.
In a defined benefit plan, the union does not get to have it both ways, that is get the defined benefit regardless of a shortfall, or receive the defined benefit plus the surplus in case of a windfall.
Thanks for your input.