Senatorial arrests

Shortly after the formation of the Galactic Empire, the Imperial Security Bureau arrested sixty-three senators of the Delegation of 2000, who were also signatories of the Petition of 2000, which included senators Tanner Cadaman, Ivor Drake, Shea Sadashassa, Fang Zar, and Grebleips. The detained senators were charged with treason and conspiracy; accused of working with and supporting the Jedi Order to attempt to overthrow Emperor Palpatine.

Such purges were expected by Bail Organa, who overtly threw his support behind Palpatine once it became clear that the Emperor had won for now. As such, he kept his post and influence, ready to work for the light when Sidious's scrutiny lapsed.

Text and facts from the “Senatorial arrests/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.