Following the publicity generated by the motorcycle gang clash in Waco, Texas last weekend, Survival Blog has put up a three-part article on gangs that contains some useful information. Follow these links:
The articles don't go into much detail, but provide a good overview. For more information, see:
There are many other resources on the Web, not all of which are as good as others. A quick Internet search will reveal many more links.
I ran into a lot of gangs and gang members during my work as a prison chaplain. Gangs are probably in your area. There are few where they aren't. Forewarned is forearmed.