Vogel's research into
treason in Nazi Germany, in partnership with
Wolfram Wette, was the first such project undertaken in Germany. Their resulting book
The Last Taboo (2007) showed that, based on the documents examined so far, the soldiers acted mostly out of ethical motives and none of their actions caused harm to civilians or military personnel. It played a role in bringing about the legislative change in 2009 in Germany, when the
Bundestag passed legislation officially rehabilitating military personnel judged "traitors" by the military justice system during World War II. ==Selected works==