Lori Kaminsky

My mother took us to the movies in the fifties to see a movie she thought would be appropriate because of the title. I thought the title was 'The Clown' but I've searched and not found it. It is about a young boy whose brother and brother's friends make him believe he has shot and killed (?) his brother, so he runs away and ends up at a carnival in a big city. The mother and brother then search for him.