He was a member of the Joint AFL-CIO Commission that investigated labor conditions in the Central Zone in January 1949, and was a member of the US delegation to the conventions of the International Confederation of Free Trade Unions (ICFTU) held in Milan, in 1951; Vienna in (1955) and Tunis in 1957.
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Romualdi resumed his work with the ILGWU in the fall of 1945, and was assigned by the American Federation of Labor to establish contacts with Latin American Labor with the view of promoting closer cooperation between the democratic trade unions of the two continents.