[Kevin]

What agzg said--if you're going to do this observe the chain of command as much as possible. Start with the President/executive body. If you don't get the change you want there, go to the advisor. If the advisor does nothing, go to your HQ. Depending on your organization, there might even be an intermediate step between your advisor and your HQ.

If you go straight to your HQ, there's a very good chance that if they believe you, they'll come and shutter your chapter, hopefully to recolonize it in 3-4 years with all of the current members banned from involvement. That seems to be the standard approach to these sorts of things with many groups.