In the inaugural Congress of September 1958 - and by prior agreement - the MP-13 merged with the Union française nord-africaine (UFNA) which had been created in 1955 by Louis Boyer-Banse and later led by Martel; Boyer-Banse had been expelled from Algeria after a demonstration against its governor general, Robert Lacoste. Martel had effectively relied on Chassin's connexions in France. Chassin was the head of the patronage committee of the Association des combattants de l’union française (ACUF) which had amongst its members prominent military and right-wing elements. At the Congress, he became embarrassed and angry at the violent words of Martel. Some senior members of the ACUF - including army generals and commanders - left the party in disgust and Chassin resigned.[4] Martel succeeded him as the MP-13 leader and a logo of a heart mounted by a cross (as that worn by the celebrated local Roman Catholic martyr Charles de Foucauld) was agreed upon. The movement had about 22 000 members, 17 000 in Algeria and 5 000 in France. The Congress was set at fifty members. Nine regional delegations were formed. On its national council of twenty members were former Alsatian regionalist and Nazi collaborator Joseph Bilger - general secretary and treasurer of the party - lawyer Roger Girard and militant nationalist Dr. Henri Martin, all former Cagoulards. Prominent members included Martel's right-hand man Maurice Crespin, neo-fascist white nationalist Dominique Venner, Vichyiste Pierre Sidos, resister and counter-espionage agent fr:Pierre de Villemarest and Paul Chevallet formerly of the fr:Union de défense des commerçants et artisans. There were different newspapers of the Movement including Salut public de l'Algérie française.[5][1][2][3]
The MP-13 collapsed in 1960 after an arrest order was issued for Martel, Martin and Crespin because of their support of "la semaine des barricades" which began on 24 January of that year, leading to the Algerian War; they went into hiding. Venner and Sidos were imprisoned. Most of the Movement's members joined the Organisation de l'armée secrète the following year.[6][3]: 79, 97 [1][2]