Rusche has been openly gay since 1970. He, with some other friends, founded the organisation Homo Heidelbergensis in 1972, the first gay group in Heidelberg. In 1973 Rusche became a member of the organisation Homosexuelle Aktion Westberlin (HAW). Later he worked in Frankfurt as an activist with Anderes Ufer. He then became a member in Aktionsgemeinschaft Unabhängiger Deutscher in Offenbach/Frankfurt and also became a member of the Green List Hessen (GLH). In 1978 Rusche he was a GLH candidate for the parliamentof Hesse, but lost with the GLH only getting 1.1% of the vote.
Later Rusche became a founding member of Sonstige politische Vereinigung DIE GRÜNEN and of the party Die GRÜNEN. Rusche was Landesgeschäftsführer of the Greens in Hesse. In 1982 the party won 8.6% of the vote in Hesse and the party was in parliament in Hesse (Hessischer Landtag) for the first time. The Green party later also won in federal elections and became a member of the Bundestag for the first time. Rusche was a member of the Bundestag from 1985 to 1987.
During his time in Bundestag, Rusche, who is openlygay,[2] worked for the equalizing of the age of consent, AIDS causes, and financial help for people with AIDS. He and Petra Kelly worked on the situation in Tibet. After he left the Bundestag, Rusche has worked for AIDS organisations and for Homosexuelle Selbsthilfe. In 2001, Rusche left The Greens because of the party's political decision on Kosovo. In 2003 he became a member of the new LGBT organisation Wissenschaftlich-humanitäres Komitee (whk) in Hesse. Since 2004 Rusche has been a delegate of Buddhistische Gemeinschaft within the Deutsche Buddhistische Union (DBU). He became one of the members of the "Rat" (board of directors) of the DBU in early 2008. On 24 August 2009 he joined the Hesse chapter of the German Pirate Party.
