From 1963 until his death, Laurendeau served as co-chair, along with Davidson Dunton, of the Royal Commission on Bilingualism and Biculturalism, a position that brought him considerable criticism from his nationalist colleagues.
As a key figure in the Royal Commission on Bilingualism and Biculturalism, Laurendeau worked closely with Davidson Dunton from 1963 until his passing, sparking intense debate among his nationalist colleagues.