During the early years of the Vichy Regime in World War II (1939–45) he played a leading role in establishing the Peasant Corporation.
He continued to publish books and articles after the war, and was an outspoken opponent of the Vatican II reforms to the Catholic church.
[2] At the Peasant Congress at Caen on 5–7 May 1937 Jacques Le Roy Ladurie, influenced by Rémy Goussault and Louis Salleron, invited the leading conservative agrarians to declare their support for corporatism.
[8] Salleron, speaking out against the "liberalo-Marxist error", advocated "the wholesale reservation of the present structure of the peasantry, which demographically, economically, socially and morally amounts to near-perfection.
"[9] The corporation struggled to become effective, handicapped by a temporary structure, internal conflicts, and actions by the Ministry of Agriculture that reduced its authority and introduced reforms without consultation.
[9] In 1944, he created draft proposals for agricultural planning in the postwar period, for large-scale technical assistance to reduce costs, and for farm equipment cooperatives.
[3] In 1956, Salleron and Jean Madiran founded the journal Itinéraires, which later became a leading organ for criticism of the reforms within the Catholic Church after the Second Vatican Council of 1962–65.