French socialist married to Laura, daughter of Karl Marx. His pamphlet 《懒惰权》 (The Right to Be Lazy, 1880) mocks the worship of work; in 1911 he and Laura ended their lives together.
Marx's famous quip 'if one thing is certain, it is that I am not a Marxist', passed on by Engels, was aimed at Lafargue and his French comrades, who called themselves Marxists. A Marxist is 马克思主义者, literally 'Marx-ism-person'.