Bozo the clown underneath a circle / slash sign.
Doug Wilson Presents-Buy Products-No Bozos 1983 Larry Harmon Picturers Corp.
This "No Bozo" button was a 1980's merchandising effort using the (anti) Bozo brand. Larry Harmon bought all the rights to Bozo from Capitol Records. He was involved in developing the look and was the voice of the Bozo character in the cartoons. He also dressed as Bozo at promotional appearances.