Vietnamese communist politician, member of the Politburo 1976-81 and from 1985; party leader from 1986. He began economic liberalization and troop withdrawal from Cambodia and Laos. Nguyen, born in North Vietnam, joined the anti-colonial Thanh Nien, a forerunner of the current Communist Party of Vietnam (CPV), in Haiphong 1929. He spent much of his subsequent party career in the South as a pragmatic reformer. He was a member of CPV's Politburo and secretariat 1976-81, suffered a temporary setback when party conservatives gained the ascendancy, and re-entered the Politburo in 1985, becoming CPV leader in Dec 1986.