LIUNA — the Laborers International Union of North America — is the most progressive, aggressive and fastest-growing union of construction workers. With over 500,000 members in the United States and Canada, we are one of the most diverse and effective unions representing public service employees today. LIUNA has put in place a foundation over the last century to that can effectively help build the new green economy. With more than 60 training centers across the country, LIUNA provides both basic construction and environmental skills crucial to green construction.