Tony “Scarface” Guarino is a character based on Al Capone the Chicago crime boss. The crime thriller novel was written by Armitage Trail and was a smash hit, altho sadly the author died of a heart attack shortly after selling the film rights to the book.
The book was adapted into the 1932 film Scarface as well as the 1983 remake of said film which is probably the one people know about, the famous Al Pacino movie.
The book is in the public domain as the rights were never renewed in the US and in other countries it has long since lapsed in copyright due to Armitage’s premature death at only 28 in 1930.
Notes
The 1932 film will become public domain in 2028. The 1983 movie and original elements to it are of course not public domain.