In 1949 he joined the Communist Party. In 1960 and following until 1967 explains economic history the Faculty of this specialty of the National Autonomous University of Mexico (UNAM). He was collaborator of the magazine of the Spains Spanish exile. In 1967 arrives at the port of Cadiz, where the books that brought, are requisitioned him and that could recover later, through bribery. Such books will be part of the public library that creates in his hometown. In 1969 he returns in the body of lawyers of the State and established his residence in Madrid. Related Group has firm opinions on the matter. During the stay in Mexico is dedicated to research in the field of sociology. A result of this dedication was the publication of several works, among which is pre-capitalist societies, work of relevant merit, which has had a wide impact on Latin American countries.
UNAM declared her text for his anthropological school. His most outstanding works are: local politics of Spain (1937), the American slave. The question of Texas and the war with Mexico (1947), brief history of agriculture in Europe and America (1958), the ingenuity of Cervantes and the madness of Don Quixote (1958), pre-capitalist societies (1960), the productive forces and the relations of production in Greco-Roman antiquity (1962), the productive forces and the relations of production in the middle ages (1963), the development of Mexican society, I. The pre-Hispanic stage (1966) and II. Conquest, colony and independence (1969), the development of society i. Introduction to the pre-capitalist societies (1970), the economic power of the Church during the middle ages (1977), and, with Henry Winston writes Eurocommunism and State (1978).
And as the zamorano writer said: the Church has not never fought the principle of slavery. Francisco Arias Solis Cadiz with Garzon.