Editors. "Social Democratic Federation holds a rally in Trafalgar Square". The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=18933, accessed 25 May 2013.]
The Social Democratic Federation, Britain's first socialist party, holds a rally in Trafalgar Square under the leadership of Henry Myers Hyndman, but the protesters are forced out of the Square by police, starting a riot.