Nineteen sixty-eight was a watershed moment in American history, to put it mildly. And nothing exemplified the changes rippling through society better than what transpired during the 1968 Summer Olympics in Mexico City: the dramatic “Black Power” demonstration of American sprinters Tommie Smith and John Carlos on the victory stand.

Fifty years after that defining moment—on Friday, July 13 at 5 p.m. ET—HBO is bringing back the 1999 Peabody Award-winning documentary Fists of Freedom: The Story of the ’68 Summer Games, which explores the forces that combined to produce the indelible image.

Fists of Freedom features HBO’s acclaimed combination of rare footage, archival photos and revealing interviews. Among the interviewees are 1968 U.S. Olympic athletes Tommie Smith, Lee Evans, Ralph Boston, Bob Beamon, Bill Toomey, Bob Seagren and George Foreman, as well as Harry Edwards and Bud Greenspan.

Be sure to tune in Friday at 5 p.m. ET for a glimpse into the turmoil surrounding that seminal moment and all the changes that came after.