Assorted right wingers and libertarians are claiming justification for Wisconsin union bashing in a quotation from FDR:
"... the process of collective bargaining, as usually understood, cannot be transplanted into the public service."
Our course, this is a quotation out of context. Look in the original letter.
FDR affirms the place of unions in government as well as private industry. He is cautioning against strikes by government employee unions as a tool of collective bargaining the way they are used in bargaining with private industry. Particularly, I want to emphasize my conviction that militant tactics have no place in the functions of any organization of Government employees. He argues that the special purposes of government make them inappropriate. He points out: It is, therefore, with a feeling of gratification that I have noted in the constitution of the National Federation of Federal Employees the provision that "under no circumstances shall this Federation engage in or support strikes against the United States Government."
This is not in any way like stripping bargaining rights from unions in government. Indeed, many states have laws that forbid government employee unions from striking, yet still have strong unions that are able to negotiate. It would be more just for those laws to balance the loss of rights to strike with limitations of government abuses of that advantage, but that's not the case that I'm aware of.