An ex-colleague of mine.
The guy kept up a nice guy act, but was fully self-centered, tried to subtly force his religious views upon the workplace, actively formed cliques to sow disorder and refused to help anyone in any matter that "wasn't in his contract". He openly criticized anything that didn't "meet his standards" and did so in an extremely condescending way.
His charisma attracted many and kept them from seeing through his act. His only goal seemed to be to gain power at any means.
I don't know why, but I found him suspicious at first handshake. Somehow he just felt totally fake to me. His duties rarely overlapped mine, so I just kept my eye on him from a distance. After about 6 months a leadership opening appeared and he instantly tried to recruit me to his clique. His warm, joyous eyes turned to ice when I turned him down and told him that I'm aware of the game he's playing.
In retaliation he started a smear campaign against me, but since I had done my duties well and had helped everyone whenever I could for the last decade, there was nothing for him to abuse. His attack backfired gloriously.
Soon after our boss called me to his office to discuss "reports of degligence in my performance". I knew that these were fabricated, but I was still a bit concerned when I entered the office. Boss told me to close the door and went straight to the point: "How are we going to get rid of this lying asshole? These reports he gave to me about you are complete bullshit, but they are not enough to fire him." The old sly fox had also been keeping his eyes and ears open and was as aware of the creep's machinations as I was.
We made sure that the creep didn't get the leadership position and started to insulate key personnel from his influence by informing them of the faked reports. In the next few months the word got around and his clique fell apart. The fucker was left pretty much alone and after that he resigned.