People for the Ethical Treatment of Animals cited Amazon's decision this week to drop "The Pedophile's Guide to Love and Pleasure," CNN reported.
In a letter sent Friday, PETA cited two books, "The Art Of Cockfighting -- A Handbook for Beginners and Old Timers" and "Dogs of Velvet and Steel." The group said that like the "Pedophile's Guide," both books encourage illegal actions.
Lindsey Rajit, a PETA spokeswoman, said in addition to encouraging animal abuse the books could do further harm to society.
"Animal abuse is one of the first warning signs we see in people who turn and direct violence toward people," she said. "This is really important because the twisted whims of people who enjoy watching animals fight to the death is not something Amazon should be catering to. There are greater societal implications."