'Freedom Riders Memorial, Little Rock' photo (c) 2013, Haydn Blackey - license: https://creativecommons.org/licenses/by-sa/2.0/

As NPR says
, on this day in 1961:

13 activists piled on a bus headed south to test new laws against segregation. The group of “Freedom Riders” that left Washington, D.C., that day would be one of many to confront racial discrimination in public transportation.

Learn more at The Best Resources For Learning About The “Freedom Riders.”