Who is Captain Harold Spencer from The Eye in the Door and what is their importance?

Spencer was an associate of Noel Pemberton Billing. Captain Spencer worked for the British Secret Service for a brief period of time. Captain Spencer claimed to have a list containing the names of 47,000 British gays and lesbians whom Spencer maintained were led into sexual corruption by the German government in order to undermine British society. Spencer was also a very vocal anti-Semite.