Was being a Sith crime in The Republic?

If the Jedi order had arrested Palpatine, would the court have declared Palpatine guilty quickly based on the proof that Palpatine was a Sith? Is there any rule stating that?

Note 1: Here, the word quickly is important because finding proofs of his political crimes would be difficult and time-consuming (could take decades).

Note 2: Here, I am assuming that Jedi somehow proved that Palpatine was a Sith (using security hologram of his conversation with Anakin in which he declared that he was a Sith).

Note 3: I am also removing Jedi murders by his hands from the equation.