When you think of Chinatown, maybe all you're really familiar with is the best place to get dim sum or purchase a set of fake plastic nunchucks.  Maybe that's all you want to be familiar with.  But a nonprofit organization in San Francisco is conducting tours that take participants through some of the lesser-known stories and darker corners and alleys of Chinatownway more than the average tourist usually ever gets to experience: 
San Francisco: An insider's take on Chinatown.  It sounds really fascintating.  Learn more about Chinatown Alleyway Tours 
here.