In 1974, Sansom invited Rooum to provide a cartoon for a monthly magazine he was working on, "Wildcat". Rooum created a character of the same name. "Wildcat" ceased publication in 1975 but in 1980, when Sansom was again working on "Freedom", he persuaded Rooum and the editorial collective to revive the Wildcat comic strip, which featured in every edition until "Freedom" ceased printing in 2014. In 2016, PM Press of California published "Wildcat Anarchist Comics", a collection of Donald Rooum's cartoons coloured by Jayne Clementson, with some autobiographical material, and "What is Anarchism 2nd edition", an expanded version of the Freedom Press "What is Anarchism" 1992.