September 27 is the beginning of "BANNED BOOKS WEEK 2020". Below is a couple of lists of ten of the most frequently challenged books.
A challenge is an attempt to remove or restrict materials, based upon the objections of a person or group. A banning is the removal of those materials from the curriculum or library, thereby restricting the access of others.
The Top Ten Most Frequently Challenged books list is compiled by the Office for Intellectual Freedom (OIF) and is based on or derived from communities across the United States. According to their data here, the ten most challenged books of 2020 were:
You can also view the previous years lists as well at OIF. However, if you're curious about the most frequently banned books for the last 100 years in America:
TEN OF THE MOST FREQUENTLY CHALLENGED BOOKS IN HISTORY: