Getty/Olivier Douliery/Lass President Donald Trump on Thursday granted a posthumous pardon to late boxer Jack Johnson, the first black heavyweight champion, who was convicted in 1913 of transporting a white woman across state lines, following the urging of actor Sylvester Stallone. The president referred to "Rocky" star as "Sly," boasting that the two have been friends for "a very long time." Trump signed the pardon for Johnson during an Oval Office ceremony.