Dark comics emerged from the crime comics genre in the early 1900s. Chester Gould's Dick Tracy in 1931 helped popularize the genre. Charles Biro's Crime Does Not Pay in 1942 marked the beginning of the dark comics genre. In the 1940s and 1950s, comic books came under scrutiny for their violent and sexual content. This led to the creation of the Comics Code Authority which strictly censored comics and ended the golden age of dark comics until artists like Frank Miller began pushing creative boundaries again in the late 1970s and 1980s.