Deciding that the only way out was to become an intellectual, he attended the École du meuble de Montréal [fr] for a time and was a supporter of Borduas' automatiste movement.
He also made 8 mm amateur films, which landed him a job as picture editor in the news department of the CBC.
Co-directed with Michel Brault, and including the important contribution of sound recordist Marcel Carrière it surpassed the candid eye approach, establishing for the first time in film history, the filmmakers in the midst of the ongoing event.
Before undertaking another feature, Groulx made the documentary short Un jeu si simple (1965), a dramatic look at the sport of hockey in the province of Quebec, and in particular, the Montreal Canadiens teams of 1950-1960.
Groulx questions their choice of lifestyle through an unconventional filmic language giving unprecedented importance to sound.
Continuing in this pamphleteering vein, Groulx made 24 heures ou plus, a veritable call to revolution, which was censored by the NFB.
In 1980, Groulx was involved in a serious automobile accident that put an end to his career, although he did manage to come back in 1982 and complete the feature film he had been working on.
Au Pays de Zom is a scathingly funny satire on the businessman ethos in the unexpected form of a musical, in which Joseph Rouleau, an opera singer greatly admired by Groulx, plays the role not of a romantic hero but of a financier.