Building Manager a bully

Hi All

Wondering if you could give me advise please.  i have been living in my very large complex for over 8 years now and over that time have seen some pretty low things that our building manager has done but recently it has gotten nasty to some friends.  To give some idea, he threatens contracters, bullies residents, has tried to intimidate some young female tenants, assaulted tenants and forced contractors to lie on his behalf or they lose their jobs, and also sworn at residents when they have requested his help.

We all believe it is time for him to go but given that he is not above using intimidation and bullying tactics I would like to know the right way to go about doing this, is a petition the right option?  Happy to go door knocking if this is the case? 

Should also note that the Strata also protects him as there have been multiple complaints that should have been put forward to the exec committee and never have…

Appreciate any advice you could give.