They are among the most viperous and seditionary forces the US has ever seen.    From Wordnik.com.  [Think Progress » Kristol On War Critics: ‘It’s So Irresponsible That They Can’t Be Quiet For Six Or Nine Months’] Reference

In the TV show, at least in the early seasons, it was implied that this was the original name for the entire race, and that the Decepticons began later as a seditionary movement among them.    From Wordnik.com.  [Archive 2009-06-01] Reference

As a matter of fact, even the most seditionary organs confessed that the tenants gained little and lost much by the change from the old type of landlord to the new, for the latter, being practical men, had no sympathy for the man who was permanently behindhand with his rent.    From Wordnik.com.  [The Reminiscences of an Irish Land Agent] Reference