BDK (Black Disciple Killers) also known as GD (Gangster Disciples) is a gang in Chicago. Rappers such as Lil Jay, P. Rico and Lil JoJo who was shot and killed at the age of just 18 by the Black Disciples, are affiliated with the gang. The gang is also known as BrickSquad, FBG (Fly Boy Gang), and Tooka Gang after fallen member Shondale Tooka Gregory. The Black Disciples, also known as GDK for Gangster Disciple Killers, are a rival gang to the Gangster Disciples, thats why they call them selves the Black Disciples KILLERS!
Main Street is a satirical novel written by Sinclair Lewis, and published in 1920.
Vanguard agreed to publish the book, and it met with high praise from critics upon release, though sales were not as impressive. Later analyses of the book have focused on its connections to Geisel's childhood; the street of the title is probably named after a street in Geisel's hometown of Springfield, Massachusetts.