Errico Malatesta and Carlo Cafiero, "the main founders of the Italian anarchist movement, both came from freethinking families (and Cafiero was involved with the National Secular Society when he visited London during the 1870s)". In the French anarchist movement Eliseé Reclus was the son of a Calvinist minister, and began by rejecting religion before moving on to anarchism. Sebastien Faure, "the most active speaker and writer in the French movement for half a century" wrote an essay titled "Twelve Proofs of God's Inexistence". German insurrectionary anarchist Johann Most wrote an article called "The God Pestilence".