A life long revolutionary socialist Leon devoted his outstanding artistic skills to furthering the cause of the working class and oppressed people around the world. He he not only drew on the revolutionary photomontage of artists like of George Grozs, Hannah Hoch and John Heartfield, but he also advanced it as printing and copying techniques evolved.
His public artist output became a powerful weapon in the arsenal of those wishing to fight for a better world. Leon's work should not been viewed as either propaganda or political cartoons - he intentionally chose to use his considerable artistic skills and knowledge to hone a language that was not only accessible to working people but would also challenge and develop the viewers class consciousness.
There could not be a more fitting epitaph to Leon's artistic output than that of Grosz on hearing that a miner from the Ruhr liked his work: "The opinion of this coal miner about my art is a thousand times more important to me than the writing of the bourgeois aesthetes."