To brainwash someone into doing something.
"The government is trying to brainwash them into thinking that war is necessary."
Cambridge Dictionary Online.
"Afghan boy suicide bombers tell how they are brainwashed into believing they will survive." The Telegraph.
"Unless the Mittster suddenly blurts out that he was brainwashed into opposing gay marriage or something, he’s going to be running against Barack Obama in the fall.
The Daily Beast.