The historian Anthony Pirie relates that Naujocks was running Salon Kitty, a brothel frequented by high-ranking Nazis and foreign dignitaries; he made a practice of recording Heydrich during his visits, until he found out.
Sejarawan Anthony Pirie menyatakan bahwa Naujocks menjalankan Salon Kitty, sebuah rumah bordir yang ditujukan kepada orang-orang Nazi dan tamu-tamu asing; ia membuat sebuah praktik merekam Heydrich saat ia berkunjung, sampai ia menyadarinya.