Since I am in a fraternity, I've heard some fraternities haze although my fraternity does not make anyone do what they don't want to do. I don't think there's anything wrong with some activities that make pledges follow certain orders and perform some physical activity. After all, organizations must have initiation rites. Besides, mild hazing can create stronger bonds among pledges. Don't misunderstand me.
Some organizations step over the line.
I have heard some fraternities on campus will make pledges drink until they throw up in a communal tub. One example of extreme hazing is the incident at the Massachusetts Institute of Technology where a pledge for Phi Gamma Delta died from drinking too much. People are generally smart enough to notice extreme initiation rituals within a few days. I can only tell prospective fraternity or sorority members not to be stupid. If the rituals seem too harsh, find another organization to join.