Jerry, your comments suggest you are fundamentally hostile to democracy. You consider it a defect in the system if people re-elect politicians who look out for their interests.

Teachers have a right to organize and advocate for their interests. That includes supporting candidates.  Anti-union, anti-teacher folks are also free to organize as a countervailing force to influence politicians, electing those who agree with you, defeating those who don't. You know, "democracy." The Republican Party, Chamber of Commerce, etc., attempt to do that. But the Dems and HSTA have more public support.

You  misstate FDR's views. He did NOT oppose public sector unions. He said their conditions were different from the private sector, which limited their collective bargaining rights and they should not employ "militant tactics," like a strike, against the public. In a letter congratulating a public sector UNION for existing for 20 years. He said they had no right to strike, not no right to exist.