Don t ever use the term gang unless your trying to start a fight. Members take their colors seriously. To offend their club is like urinating on the American flag. Don t do it unless you are willing to fight to the death. Same reason folks join any organizations.
Some clubs are for fun and games.
Most are brotherhoods or sisterhoods whose basic functions is safety in numbers. The big difference with some clubs, is the vows you take are quite serious, and binding. What you get, is what you are willing to give the club. Like a good marriage, the club will always be there when you need it. Pick your club wisely.