[Reily]

LBJ solidified federal unions in place with legislation. It will take legislation to undo it.

[T Ruth]

My understanding was that the purpose of the EO was to forestall legislation. However, provoked by your post, I did some checking and found that "President Carter signed Title VII, the Federal Service Labor-Management Relations Statute, into law as part of the Civil Service Reform Act on October 13, 1978, effective January 11, 1979."

I still would argue that this is a violation of the separation of powers. Some future President could ignore it the way Biden ignores the immigration laws, but with a much better legal basis.