Yves "Le Boss" Buteau (1951 – 8 September 1983) was a Canadian outlaw biker and gangster, known for being the first national president of the Hells Angels Motorcycle Club in Canada.

Buteau began his life of organized crime as a member of the Montreal-based Popeyes biker gang and, by the mid-1970s, he became the club's president.

Buteau was initially a member of the Mongols, a Québécois outlaw biker gang based in Drummondville with no affiliation with the American club of the same name.

[3] Buteau, a charismatic tall man with blonde hair and blue eyes, inspired much affection and loyalty from his fellow Popeyes, who were seen as the most violent of Quebec's 350 outlaw biker clubs.

[3] Buteau was considered to be both a fighter and a diplomat as he was able to maintain good relations with other biker gangs such as the Missiles of Saguenay and the absurdly named Sex Fox of Chibougamau.

[5] At the same time that the Popeyes were feuding with the Devil's Disciples, the club was also quarrelling with the Montreal chapter of Satan's Choice, which had expanded into Quebec from Ontario in 1967.

[6] Although the Popeyes won control of the area around Saint Henri Square, the arrest of the Dubois brothers cut them off from their largest supplier of drugs.

Initially, the Hells Angels had planned to "patch over" the Devil's Disciples, but as the Popeyes had eliminated them, Barger switched over to courting Buteau.

[7] It is believed that Buteau targeted the Devil's Disciples at least in part for that reason as he wanted his club to become the first Hells Angels' chapter in Canada.

"[7] Barger praised Buteau and the Popeyes as the most "hardcore" outlaw bikers in Canada, thereby making them the ones most worthy of becoming Hells Angels.

As president of both the Popeyes and then the Hells Angels, Buteau worked as a subcontractor for the Irish-Canadian West End Gang, who had replaced the Dubois brothers as their main supplier of drugs.

[10] The two Outlaws stood outside the Brasserie Joey, loudly cursing the Angels, when a green car appeared out of the snowy darkness.

[12] On 25 April 1978, Denis "Le Curé" Kennedy and another Hells Angel were able to enter the Outlaw clubhouse at 144 rue Saint-Ferdinand and went on a shooting rampage.

[13] On 26 April 1978, an Outlaw, Anathase "Tom Thumb" Markopoulos, was gunned down outside of a convenience store by a gunman in a green car, being killed after taking six bullets through his back.

[13] On 27 April 1978, Kennedy shot and badly wounded an Outlaw, François Poliseno and his girlfriend, Suzanne Harvey, while the two were drinking at the Industrial Brasserie bar.

[14] Witnesses described the gunman who shot Poliseno and Harvey as leaving in a green car, which the police found parked outside of the Angels' clubhouse.

[21] In the spring of 1982, at a meeting of Quebec Hells Angels, he demanded that group members quit the use of cocaine, but the ban was widely flouted, especially by the Laval-based North chapter.

[24] The expansion into British Columbia was in the words of biker expert Daniel Wolf "a major international coup for the Hells Angels MC conglomerate.

Buteau had just left Le Petit Bourg restaurant in Longueuil together with Gilbert and René Lamoureaux of the Angels, and the three men were smoking cigarettes in the parking lot when Goudreau ambushed them.

[26] Buteau was replaced by Michel "Sky" Langlois as the Hells Angels' national president, who fled Canada to Morocco in 1988 to escape charges of first-degree murder relating to the 1985 Lennoxville massacre.