Metalious stepped over the line herself in regards to Tomas Makris. He was a colleague of Grace’s husband (principal) and his name and physical description made it into Peyton Place. He sued:
Famously, Metalious was sued for libel by one of the people who was included in the book. Tomas Makris was featured in Peyton Place , and his name and physical characteristics matched the real-life individual. Notably, the character’s name in the UK edition was changed to Michael Kyros, and the character’s name was changed in later US editions to Michael Rossi. In a shocking twist that infuriated many, Metalious had actually forged Makris’ name on the release form. Such behavior is of course condemned by the literary community.
I understand Makris’ name was changed in the TV series and in the movie but am less sure about books in the U.S.
Grace also alienated others in the town though none as egregiously as poor Mr. Makris. (Actually I’m curious as to why she evidently wanted Makris in the book badly enough to forge his name.)