Avi Dichter was the head of the Shabak and he was extremely cruel at that. He persecuted Jewish pioneers in the peak of the murderous Second Intifada. Among the many Jews he persecuted was Itzik Pass from Hebron, whose baby daughter Shalhevet Pass was murdered by the Fatah. He tried to avenge her murder and was arrested and tortured by Dichter's Shabak.
He also supported and advocated for the expulsion from Gush Katif as well as giving the Golan Heights to Syria.
Dont get me wrong, he is not a leftist, that would be a compliment for him. He is a monster with 0 ideology, this is why he switches parties like a prostitue.