When it comes to suits for damages for abuse of power, federal officials are usually governed by local law. See, e. g., Slocum v. Mayberry,2 Wheat. 1, 10, 12. Federal law, however, supplies the defense, if the conduct complained of was done pursuant to a federally imposed duty (see, e. g., Mayor v. Cooper,6 Wall. [...]

Here, at Constitution.org I found this:

Sec. 149. THOUGH in a constituted common-wealth, standing upon its own basis, and acting according to its own nature, that is, acting for the preservation of the community, there can be but one supreme power, which is the legislative, to which all the rest are and must be subordinate, yet [...]