"Despite their success, Jerry and Joe had a beef with the world. Back in 1938 they had signed away the Superman copyright to Harry Donenfeld for $130-$10 for each of the 13 pages of “Action Comics” No. 1. True, they were not making well above the standard industry rate and had a ten-year contract that assured them steady work and a good income. But they knew that millions were flowing in from the merchandise sales and media ventures, and most of it was ending up in the pockets of other people. And why should Harry Donenfeld get rich off Superman? He hadn’t envisioned the character and spent years perfecting it. As the Cleveland collaborators churned out page after page, week after week, month after month, Donenfeld continued to build the Superman empire, even as he added new superheroes and comic books to his stable. Before long, friends would greet the party-loving publisher in fancy restaurants with the line “Hiya, Superman,” at which point he would tear open his shirt and throw out his chest to expose his blue T-shirt with the big red S on the front."
January 1, 1970
https://en.wikiquote.org/wiki/Superman