An examination of 213 denunciations in Düsseldorf showed that 37% were motivated by personal conflicts, no motive could be established in 39%, and 24% were motivated by support for the Nazi regime. The Gestapo always showed a special interest in denunciations concerning sexual matters, especially cases concerning with Jews or between Germans and foreigners, in particular Polish slave workers; the Gestapo applied even harsher methods to the foreign workers in the country, especially those from Poland, Jews, Catholics and homosexuals. As time went by, anonymous denunciations to the Gestapo caused trouble to various NSDAP officials, who often found themselves being investigated by the Gestapo.