This scientific article is devoted to the phenomenon of left-wing socialists in modern Latin America. The article shows the continuity of the left-wing socialist ideology and at the same time highlights the elements of its novelty. The author turns to plots related to the historical aspects of the activities of radical socialists in Latin America. The author examines the various forms of organized activities of radical socialists, pointing as examples of the functioning of the independent left-wings socialist parties ant the participation of left socialists in Latin American countries in broader political projects. An important place is given to the consideration of the left socialist proposals for politico-institutional and socio-economic areas. Here analysis confirms that today the radical socialists continue to be in the political area between the radical left and social reformism. The author comes to the conclusion that the left socialists actively advocate strengthening the unity of the left forces both in Latin America as a whole and at the national level.