 He states that National Socialism more nearly paralleled Russian communism than any other noncommunist system has.In the 1960s, his books were published in Spanish by , a publishing company set up by Spanish Republican exiles in Paris, France, to publish works forbidden in Spain by the Francoist regime ruling the country at the time.His position regarding the Spanish Civil War has been that of shedding light on the conflict's origin and addressing its related myths and as a result by some historians he is considered a revisionist.