As one of the most prominent lawyers of Montreal in the 1870s and 1880s, Alexandre Lacoste was involved in some way with almost all of the major cases of his era, and, on more than 20 occasions, he travelled to Great Britain to argue before the judicial committee of the Privy Council.
Alexandre Lacoste, un des plus éminents avocats de Montréal dans les années 1870 et 1880, se trouva mêlé à presque toutes les grandes affaires de son époque. À plus de vingt reprises, il se rendit en Grande-Bretagne pour plaider devant le comité judiciaire du Conseil privé.