Given the question: Generate a question that has the following answer: Billyboy. for the following movie plot: In futuristic London, Alex DeLarge is the leader of his "droogs", Georgie, Dim and Pete. One night, after getting intoxicated on drug-laden "milk-plus", they engage in an evening of "ultra-violence" including a fight with a rival gang led by Billyboy. They drive to the country home of writer F. Alexander and beat him to the point of crippling him for life. Alex then rapes his wife while singing "Singin' in the Rain". The next day, while truant from school, Alex is approached by his probation officer Mr. P. R. Deltoid, who is aware of Alex's activities and cautions him. Alex's droogs express discontent with petty crimes and want more equality and high yield thefts, but Alex asserts his authority by attacking them. Later, Alex invades the home of a wealthy "cat-lady" and bludgeons her with a phallic statue while his droogs remain outside. On hearing sirens, Alex tries to flee but Dim smashes a bottle on his face, stunning him and leaving him to be arrested by the police. With Alex in custody, Mr. Deltoid gloats that the woman he attacked died, making Alex a murderer. He is sentenced to 14 years in prison. Two years into the sentence, Alex eagerly takes up an offer to be a test subject for the Minister of the Interior's new Ludovico technique, an experimental aversion therapy for rehabilitating criminals within two weeks. Alex is strapped to a chair, injected with drugs, and forced to watch films of sex and violence with his eyes propped open. Alex becomes nauseated by the films, and then recognizes the films are set to music of his favorite composer, Ludwig van Beethoven. Fearing the technique will make him sick on hearing Beethoven, Alex begs for the end of the treatment. Two weeks later, the Minister demonstrates Alex's rehabilitation to a gathering of officials. Alex is unable to fight back against an actor that taunts and attacks him, and becomes ill at the sight of a topless woman. The prison chaplain complains Alex has been robbed of his freewill, but the Minister asserts that the Ludovico technique will...
The answer is:
Who is the leader of the rival gang?