Unions in the public sector are something even FDR hated, and he's often cited as the most liberal president. Although I can't say I agree with the way in which the anti-union deal was pushed through -- very slimeball-y.
"All Government employees should realize that the process of collective bargaining, as usually understood, cannot be transplanted into the public service. It has its distinct and insurmountable limitations ... The very nature and purposes of Government make it impossible for ... officials ... to bind the employer ... The employer is the whole people, who speak by means of laws enacted by their representatives ..."