Mamadou Bah joined LiUNA Local 506 in 1990. He has worked in several sectors, including precast, demolition, concrete and general construction. In 2002 he was appointed as a Business Representative for Local 506, the first Black Business representative in Canada. He has served on numerous committees including LiUNA Ontario District Council Minority Group, Ontario Building Trades, Canadian Labour Congress, CLC Workers of Colour, CLC Human Rights Advisory and Toronto & York Region Labour Council. Mamadou volunteers his time Working with Black youth through the TCBN NexGen Mentorship Program and sits on the LiUNA African American Caucus board.