Like it or not, the crooks of this world are always more intriguing characters than the law abiding citizens. It is their names and deeds that are remembered through the ages. In Crooks, Crime and Corruption , the reader will find a fascinating line up of notorious crooks, villains, thieves and swindlers from the Moors murderers and Charles mason to Al Capone and the man who sold the Eiffel Tower -- twice!
Various is the correct author for any book with multiple unknown authors, and is acceptable for books with multiple known authors, especially if not all are known or the list is very long (over 50).
If an editor is known, however, Various is not necessary. List the name of the editor as the primary author (with role "editor"). Contributing authors' names follow it.
Note: WorldCat is an excellent resource for finding author information and contents of anthologies.