Editors. "German anti-socialist law of 1878 expires". The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=19039, accessed 19 April 2014.]
German anti-socialist laws, first implemented in 1878, expire. At the Erfurt Congress soon after, the Social Democratic Party openly adopt a Marxist programme for the first time.