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HIAG, short for Hilfsgemeinschaft auf Gegenseitigkeit der Angehörigen der ehemaligen Waffen-SS, was a lobby group that Meyer became active with. Formed in 1951, its primary objective was to provide mutual assistance to former Waffen-SS members, including legal representation and financial support. The organization sought to rehabilitate the image of the Waffen-SS and advocated for the rights and welfare of its former members.