I say use the FDR didn’t support public sector unions at all due to the fact that it would put the taxpayers against the union.
He caved.
Now if you'd like to argue that FDR was PO'd about the federal unions disposing of Commies, go right ahead.
That won't get you what you imagine.
Really, everything there is to know about FDR has been out there for years and years ~ and there are NO SURPRISES, nor do most people give a flying whatsit regarding what FDR said or did at this stage.