 Creator-owned titles began to appear during the late-1960s underground comix movement, including the publishing collective Cartoonists Co-Op Press, and the Robert Crumb-led United Cartoon Workers of America.Similar movements began in the superhero genre with the mid-1970s creation of the short-lived company Atlas/Seaboard Comics.During the 1970s, superstar artist Neal Adams was politically active in the industry, and attempted to unionize its creative community.