text: Though the fair employed up to 20,000 people, the WFC directly employed only about 180 to 200 people. Conversely, there were 3,000 Pinkerton employees on the grounds, including firefighters, police officers, medics, matrons, and ticket sellers. Nine garbage trucks, nine EMS vehicles, 25 police cars, and three fire engines traveled the fairgrounds, and nine city health inspectors examined all restaurants on the fairground. United Press International was the fair's official photographer, while United World Films had exclusive rights to produce and publish films about the fair. Allied Maintenance was the only maintenance firm allowed to work at the fair, and it charged exorbitant fees, earning $10 million during 1964 alone. Allied also handled deliveries during the 1964 season and was replaced by the Rentar Corporation the following year. Other companies, such as Hertz and Cities Service, sponsored free services or events. The WFC selected symbols of a boy and a girl as the fair's mascots.
  Exhibitors were required to operate from 10 a.m. to 10 p.m. daily, although the fairground opened at 9 a.m. Exhibits were prepared and cleaned throughout the night, though the Vatican pavilion was the only attraction with a live-in caretaker. Many exhibitors hired a racially diverse staff as well. In addition, the WFC required each exhibitor to purchase insurance from the firm of Campo & Roberts, which earned $3 million from insurance commissions.