The secretive group of classic cars in Pixar's Cars 2 is called the Lemons.
The Lemons are an international criminal organization made up of cars from historically notorious or unreliable automotive lines. Their name is a pun on the idea of a “lemon,” a vehicle that is defective or disappointing, and it connects the spy plot to automotive history.
Professor Zündapp serves as the group's operational leader, while Sir Miles Axlerod's public identity conceals his role in the larger conspiracy. The Lemons manipulate the World Grand Prix and use Allinol-related technology as part of their plan.
The group is sometimes confused with the film's racing competitors or with the fictional fuel company. The World Grand Prix is the public sporting event; Allinol is the promoted fuel; the Lemons are the criminal network behind the sabotage.