Los Angeles police arrested about three dozen alleged members of the Rollin' 30s Harlem Crips (a.k.a. Ice-T's former gang) yesterday on federal and state charges related to gang operations and drug dealing. It was the culmination of an investigation called "Operation Thumbs Down," a reference to a popular Rollin' 30s hand sign: two thumbs up.

Dartmouth College, the lily-white investment banking camp of the Ivy League, prides itself on its purposely insular and routinely violent fraternities. These two features magically combined last month when Animal House inspiration Alpha Delta decided to throw an enormous “Bloods and Crips”-themed party. Now they’re very, very, very sorry.

After McDonald's and the Black Eyed Peas, America's most successful cultural exports are the Bloods and Crips. Londoners have recognized that our gangs are much stronger brands! But they're doing Blue-on-Red gang war the UK way.

Police say that America's most dangerous gangs are increasingly turning to Twitter as a communication tool for their criminal networks. We investigated the Twitter accounts of five notorious sets; the results may alarm you.

"You see African-Americans dealing with Hispanics on obtaining narcotics and weapons. We're seeing Hispanic gang members involved with the Eastern European criminal figures," said Robert W. Clark, acting special agent in charge of the criminal division of the Los Angeles field office of the Federal Bureau of Investigation. "Where they see opportunities to collaborate, they do."