Which 1991 novel by Bret Easton Ellis was banned in several countries for extreme violence?

The 1991 novel by Bret Easton Ellis banned in several countries for extreme violence is American Psycho.

The novel is narrated by Patrick Bateman, a wealthy Manhattan investment banker whose polished consumer lifestyle exists alongside horrific acts of violence. Ellis uses Bateman’s unreliable narration, repetitive brand descriptions, and emotional emptiness to satirize Wall Street culture, yuppie excess, misogyny, and the dehumanizing logic of consumerism.

American Psycho became controversial before publication because of its graphic depictions of torture, sexual violence, and murder. Simon & Schuster cancelled the original U.S. publication arrangement in 1990, while Vintage later published the book in 1991. Germany restricted its sale to adults for several years, and Australia classified it R18; Queensland imposed especially severe restrictions. It was also restricted in New Zealand. A common mix-up is treating the 2000 film as the original source: the film stars Christian Bale, but the banned and challenged work in this question is Ellis’s novel.