Following Rockwell's assassination in 1967, control of the WUNS passed to Matt Koehl, who attempted to extend the influence of the group by appointing Danish neo-Nazi Povl Riis-Knudsen as general secretary.
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He would go on to rejoin the British Movement, although he left due to his dissatisfaction with the leadership of Michael McLaughlin and instead devoted much of his energies to the World Union of National Socialists, at the time led by Povl Riis-Knudsen.