Michael Davis, one of three Occupy Oakland protesters the Alameda County District Attorney's Office has charged with felony counts of robbery and hate crimes. 
Nneka Crawford, one of three Occupy Oakland protesters the Alameda County District Attorney's Office has charged with felony counts of robbery and hate crimes. 
Randolph Wilkins, one of three Occupy Oakland protesters the Alameda County District Attorney's Office has charged with felony counts of robbery and hate crimes.1. TEAR DROP TATTOO
The tear drop tattoo has had many different meanings. When they were first worn they meant that the wearer had been incarcerated and or killed someone while in or out of prison. As times have changed however, the teardrop has come to symbolize a friend or fellow gang member or family member that has died while the wearer is incarcerated.
Now however the teardrop seems to have become a fad, which granted has gotten people in trouble.
It has also been used as a gang identifier. If it was on the right it meant you were a Crip or part of the Folk Nation, on the left meant Blood or People's Nation. . .
http://www.urbandictionary.com/define.php?term=tear%20drop%20tattoo