spoilers

I was actually referring to Bernard, who was the main protagonist for most of the book. Bernard, Helmholtz and John are brought before Mustapha Mond, the Resident World Controller for Western Europe. Bernard and Helmholtz are told they will be exiled to islands of their choice. Mond explains that this exile is not so much a threat to force freethinkers to reform and rejoin society, as it is a chance for them to act as they please because they will not be able to influence the population. He also divulges that he too once risked banishment to an island because of some scientific experiments that were deemed controversial by the state, giving insight into his sympathetic tone. Helmholtz chooses the Falkland Islands, believing that their terrible weather will inspire his writing, but Bernard simply does not want to leave London; he struggles with Mond and is thrown out of the office. - from wikipedia

John aka "The Savage" does indeed hang himself, although I don't remember if he himself participated in the orgy and it sounded like he went a bit insane before the orgy even started. He basically tries to hide away in some abandoned lighthouse where he regularly whips himself. Then somebody spots him, and then crowds gather to watch him whip himself. He then turns on the crownd and attacks the girl that had a crush on him (who he partly disliked because she did not make it difficult enough to win her affection). Then the crowd reacted the only way they know how by having an awesome orgy. Which is by far the best way to solve any dispute, imo. And seeing how his private suffering turned was used to spark everybody's hedonistic fun, John killed himself.