Common joins us to discuss "The 13th," Ava Duvernay's documentary chronicling the history of racial inequality in the United States. "The 13th" examines how our country has produced the highest rate of incarceration in the world, with the majority of those imprisoned being African-American. Common's anthem “Letter to the Free,” is the end-title track from the film. The lyrics tackle America’s racial divide and reflect the film’s focus on the prison system as a new form of slavery in America. Interview at AOL HQ in NYC for BUILD Series.