By the 1970s, the sex shops had grown from the handful opened by Carl Slack in the early 1960s. From 1976 to 1982, Soho had 54 sex shops, 39 sex cinemas and cinema clubs, 16 strip and peep shows, 11 sex-orientated clubs and 12 licensed massage parlours. The proliferation of sex shops dissuaded some people from visiting Soho. The growth of the sex industry in Soho during this time was partly caused by corruption in the Metropolitan Police. The vice squad at the time suffered from police officers enforcing against organised crime in the area, while simultaneously accepting bribes. This changed following the appointment of Robert Mark as chief constable, who began to crack down on corruption. In 1972 local residents started the Soho Society in order to control the increasing expansion of the sex industry in the area and improve it with a comprehensive redevelopment plan. This led to a series of corruption trials in 1975, following which several senior police officers were imprisoned. This caused a small recession in Soho which depressed property values at the time Paul Raymond had started buying freeholds there.