I was one of the Founding Fathers for my frat (almost 15 yrs old). Although hazing did not happen amongst the Founders, it did eventually become part of the ritual of pledging. The biggest thing, I think, was for pledges to shave their heads. They did a lot of other shit too, but that was probably the most harsh. That changed, too, when we re-inacted our founding principles.
We are a pretty "by-the-line" group; the nationals make sure of that, but I am sure some hazing still exist. Hell, the motto was/is: "I had to do.... so, if I had to do it, then you are sure as hell gonna do it!"
BTW, I am still a very active alumni member and have held several national officer positions with my organization.