With the help from Clayton Van Lydegraf, the Weather Underground sought a more Marxist–Leninist ideological approach to the post-Vietnam reality.[97] The leading members of the Weather Underground (Bill Ayers, Bernardine Dohrn, Jeff Jones, and Celia Sojourn) collaborated on ideas and published a manifesto: Prairie Fire: The Politics of Revolutionary Anti-Imperialism.[2][98] The name came from a quote by Mao Zedong, "a single spark can set a prairie fire."