Just throw some money around and get that changed. Take the lesson from MEK (Mujahedeen-e-Khalq, previously called a “cult-like” terrorist group by the State Department). MEK got itself removed from the terror list by just funneling big bucks to lobbyists and politicians. Elaine Chao, the DOT Secy and Mitch McConnell's wife, made $50k for a 5-minute speech before MEK. Guliani got big bucks for a short speech. Now, the irony is that MEK (along with other ME entities) is behind the push to vilify other elements of the Iranian regime. I don't know if these groups should be targeted by the U.S. Gov't, I just know I'm a little apprehensive if there is any input from a special interest group throwing money around Washington and buying off politicians. I'd feel this way even if the group's interests coincided with my own.
https://www.theguardian.com/world/2012/sep/21/iran-mek-group-removed-us-terrorism-list