It's almost like our Constitution spells out how "Treason against the United States, shall consist only in levying war against them, or in adhering to their enemies, giving them aid and comfort." https://www.law.cornell.edu/constitution/articleiii
It's almost like James Madison knew from experience there'd be someone who would float this type of proposal, and so codified a rebuke into the supreme law of the land, some 200 years in advance.
(Postscript. The obvious next step is for you to change your mind and stop saying these random members are committing oligarchycrimes and say instead that Trump himself is giving "aid and comfort" to our enemies in Russia. I'm sure there's some lovely jurisprudence to be had getting that laughed out of the courts and wish you the best of luck.)
What is "appropriate" for "traitors"? Execution? Prison? Being stripped of their rights, including the right to participate in the democratic process?
You see, the irony is that alleging vague subversive activity from your political enemies and then dealing with the "traitors" like this subverts the republic, turning it into a new oligarchy. It's a very banana-republic suggestion.