29 Mar 1968, Memphis, Tennessee, USA — National Guard bayonets block Beale Street as African-American protesters march through downtown Memphis wearing placards reading “I A MAN.” The previous day’s march had broken out in rioting and looting, with one killed and 70 injured. Rev. Martin Luther King, Jr., who had left town after the first march, would soon return and be assassinated. — Image by © Bettmann/CORBIS