O Block: The most dangerous block in Chicago is 64th and King Dr.

The most dangerous block in Chicago isn’t in Englewood or on the West Side. It’s a stretch of South King Drive where a young Michelle Obama once lived. They call it “O Block.” On maps, it’s the 6400 block of South Dr. Martin Luther King Jr. Drive. But it’s just O Block to people there and in frequent references to the street in the blood-drenched lyrics of Chief Keef and other Chicago rappers.