United Brotherhood of Carpenters & Joiners of America | 12,194 followers on LinkedIn. The United Brotherhood of Carpenters is one of North America’s largest building-trades unions, with nearly a half-million members in the construction and wood-products industries. We are leveraging our 130-year history to prepare for tomorrow by training, educating, and representing the next generation of construction professionals. Our mission is to stand strong for our signatory contractors and help them succeed in today’s marketplace by supplying them with motivated, knowledgable crews that demonstrate skills, productivity, and a strong work ethic every day.