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Martin Sellner (born January 8, 1989, Vienna) is an Austrian white nationalist activist, leader of the right-wing extremist Identitarian Movement of Austria.
In his youth Sellner was part of the Austrian militant Neo-Nazi group that formed around Gottfried Küssel. From this time he has got a criminal record. After the group was outlawed and a lot of its leaders were sent to prison, Sellner and others founded the Identitarians instead. In April 2016, he disturbed a theatre-performance of Elfriede Jelinek's piece "Die Schutzbefohlenen" backed by around 30 members of his organisation, where fake blood was spilled and refugees were attacked. 
From Wikipedia.