Jagan returned to British Guiana in October 1943 and was soon joined by his American wife, the former Janet Rosenberg, who was to play a significant role in her new country's political development. Although Jagan established his own dentistry clinic, he was soon enmeshed in politics. After a number of unsuccessful forays into Guyana's political life, Jagan became treasurer of the Manpower Citizens' Association (MPCA) in 1945. The MPCA represented the colony's sugar workers, many of whom were Indo-Guyanese. Jagan's tenure was brief, as he clashed repeatedly with the more moderate union leadership over policy issues. Despite his departure from the MPCA a year after joining, the position allowed Jagan to meet other union leaders in British Guiana and throughout the English-speaking Caribbean.