Killer Mike's second official album, I Pledge Allegiance to the Grind, was released on his own Grind Time Official label in 2006, followed by I Pledge Allegiance to the Grind II in 2008.
According to an article published in the June 2007 issue of XXL, Killer Mike addressed why he left the Purple Ribbon roster. He stated that he felt as if Purple Ribbon was the equivalent to the "Clippers," while he wanted to join the "Lakers." T.I. later announced that he and Killer Mike had been in talks about bringing Mike to his Grand Hustle imprint on Atlantic, and Killer Mike confirmed that he had signed in December 2008. Read more about Killer Mike here.