Tom Van Flandern's book aninymously criticizing relativity while he was alive.

"AI: "The Einstein Hoax: The Disastrous Intellectual War on Common
Sense" is a book by Tom Van Flandern that critiques Albert Einstein's
theories, particularly relativity."
It is published under the pen name H. E. Retic, as explained in the
About the Author section, where he describes Van Flandern's career.