 His correspondent at the time was notable Russian scientist and major Anarchist ideologist Kropotkin, at that time living in the UK, who proposed that Doukhobor peasantry, numbering several thousand people, be settled in Canada.Through several years that followed, he took a keen interest in the Doukhobor cause, siding with them in cases of conflict with Canadian authorities.Kropotkin warmly regarded Mavor as a friend and later recalled that Mavor was "a living encyclopedia of Canadian economics."