In Greensboro, North Carolina, four black students begin a sit-in
at a segregated Woolworth's lunch counter. Although they are
refused service, they are allowed to stay at the counter. The event
triggers many similar nonviolent protests throughout the Southern
United States.
Citation:
Editors. "The sit-in movement begins".
The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11064, accessed 18 May 2013.]