Baldanzi began his work intrade unionism by founding the Dyers Foundation, a textile workers union that would eventually expand into the AFL-affiliated United Textile Workers. Baldanzi was, with Emil Rieve, one of the founding members of the Textile Workers Union of America in 1939. He had been elected president of the original United Textile Workers of America when its previous president, Frank Gorman had been removed. Rieve was elected as president of the TWUA, and Baldanzi served as the organization's executive vice president. He also served as the chairman of the CIO's Italian-American Trade Union committee during World War II.
Operation Dixie
Baldanzi was an advocate for organizing textile workers in the Southern United States, arguing with Northern delegates at the CIO's convention that they should not be seen as invading. When the CIO decided to launch an organizing campaign in the South, dubbed Operation Dixie, Baldanzi was named its deputy director, serving with director Van Bittner. Baldanzi was made the leader of the CIO's Southern Organizing Committee in August 1949 upon Bittner's death. Baldanzi spent time organizing in the South before this, and organizers under his direction had made progress as early as 1942 in Danville, Virginia and Durham, North Carolina that contributed to his reputation within the TWUA. While Bittner worked from Atlanta, Baldanzi chose to operate out of Greensboro, North Carolina because it was close to many textile plants.
Break with Rieve
Baldanzi was re-elected executive vice president of the TWUA by the delegates at the union's convention in 1950. Rieve and those allied to him tried to convince delegates not to re-elect Baldanzi because the two were unable to work together. Following the 1952 convention, Baldanzi signed as national organizing director for the UTWA, which was affiliated with the AFL. Following his decision, between 25,000 and 35,000 members left the TWUA. Baldanzi's separation from the TWUA also caused a decrease of the organization's effectiveness in the Southern United States, since the union had to use its resources to prevent Southern textile workers from following Baldanzi to the AFL.
Personal life
Baldanzi and his wife, Lena Parenti, had one son Georgino. Baldanzi died at his home in Hawthorne, New Jersey, on April 16, 1972, at the age of 65.