Zap Comics was an 'underground' publication. Here's a good write-up about them in CounterPunch
http://www.counterpunch.org/jacobs03122005.html $this->bbcode_second_pass_quote('', 'I') regained some of that obsession the day I saw the first three ZAP Comix in a head shop in Germany. For those of you unfamiliar with ZAPs, they were the best of the underground comix that were published in the late 1960s and throughout the 1970s. R. Crumb, Denis Kitchen, Spain, S. Clay Wilson, Moscosco, Robert Williams and so on-all of the best artists filled the pages of these psychedelic, mind-bending, rude and antiestablishment exercises in expression. Part of the rebellion against the moralistic Comics Code that mainstream comics had to adhere to, underground commix laughed in the face of this attempt by the puritans to regulate what people could read. If someone was looking for a way to be offended, they could find it in ZAP. For the rest of us, ZAPs and their sister publications were cutting social and political criticism. Whether it was R. Crumb drawing and writing a story about Whiteman, the screwed-up representative of male middle-class America or S. Clay Wilson sharing his intricately drawn tales of brutality and excess among bikers and pirates, these comix rearranged the often-dull world we live in. They weren't light reading and sometimes not very pretty, but neither is the daily news. At least comix are fun.
S. Clay Wilson's demented brutal comics were an eyeful!