Although its exact nature has been much discussed, Renardism combined elements of syndicalism and regionalist politics which ultimately sought the transformation of the country into a federal state.
He strongly opposed the return of Leopold III during the Royal Question (1950) and supported the Belgian general strike of 1960–61.
When the strike collapsed, he participated in the formation of the Mouvement populaire wallon [fr] (MPW) party.
[2] Renard's political ideas attracted a following within the FGTB and the Walloon Movement and outlived his own death.
A staunch populist, inspired by Trotskyism and anarcho-syndicalism, Renard aimed to use industrial action to achieve structural reform which would provide greater autonomy to Wallonia and improve the situation of the working class.