Ion William Croitoru (December 7, 1963 – February 21, 2017) was a Canadian professional wrestler and outlaw biker, known to wrestling fans by his ring names Johnny K-9, Taras Bulba and Bruiser Bedlam. Croitoru worked in several Canadian wrestling promotions, including Stampede Wrestling, and later wrestled for New Japan Pro-Wrestling, Smoky Mountain Wrestling (SMW) and the World Wrestling Federation (WWF, now WWE). He wrestled as a jobber in the WWF but was booked to win titles in several other promotions.

Croitoru was notorious for his long history of legal problems. As a member of the Satan's Choice Motorcycle Club (SCMC), an outlaw biker gang, he was convicted of assault, trafficking cocaine and bombing a police station. In 2005, Croitoru was arrested for the murder of lawyer Lynn Gilbank and her husband Fred; the charges were eventually dropped due to insufficient evidence. Croitoru was then arrested in May 2009 for conspiracy to murder the Bacon Brothers, resulting in the killing of Jonathan Barber. He pleaded guilty in July 2013 to conspiracy in exchange for a stay of proceedings on the murder charge.

Croitoru was the focus for episode 11 of the third season of the Vice TV documentary series Dark Side of the Ring.

Ion William Croitoru was born to Romanian parents in Hamilton, Ontario, Canada. He grew up in the working class district of East Hamilton and as a teenager exercised at a local gym known as Bad Boy's. Before entering professional wrestling, Croitoru claimed that he played junior hockey for the Kitchener Rangers in the Ontario Hockey League. According to the journalist Paul Legall of The Hamilton Spectator, Croitoru only played very briefly for the Rangers, going on to write: "But a coach-who didn't like his bruising style-bounced him and squelched any dreams he had of professional hockey." However, no record of Croitoru's time with the Rangers can be found. He was an accomplished weightlifter and once bench pressed 625 pounds.

Croitoru began his career as a bouncer in a Hamilton bar, and was recruited into wrestling after being observed by a patron who happened to be a wrestler. He trained with Nick DeCarlo and Victor Rosettani Sr. before debuting in Stampede Wrestling in 1984. Bruce Hart gave Croitoru the ring name Orhan Turgedan, the Terrible Turk, a name he only wrestled under for a short time after leaving the promotion. Croitoru continued to wrestle in independent promotions across Canada, such as Grand Prix Wrestling in the Maritimes and Superstars of Wrestling in Windsor, Ontario.

In 1985, Croitoru entered the U.S. wrestling scene and joined the American Wrestling Association (AWA), where he received a push and was given a reign as AWA Southern Heavyweight champion. He defeated Jerry Lawler to win the belt on August 16, but dropped it back to Lawler in a rematch on September 6. The following month, Croitoru joined the World Wrestling Federation (WWF, now WWE) as Johnny K-9, where he competed until 1989. Croitoru claimed that he decided on this name while being arrested after a fight; he saw "K-9" written on a paddywagon and decided on the ring name.

Croitoru's signature moves were the Stomach Claw and the Flying Headbutt. Standing six feet tall, shaved completely bald and sporting a Fu Manchu moustache, he was typecast as a heel, who excelled in generating heat (fan anger) by his exploits in the ring. Croitoru usually showed up in the ring wearing black tights and a collar around his neck, and proceeded to generate heat from the audiences before his matches started. One television commentator stated that Croitoru's fighting style was "like an animal or a dog." Canadian journalist Adrian Humphreys called him a "hugely entertaining and dirty fighter" whose antics made him natural as a heel. Croitoru liked his "bad boy" image, once telling a reporter he was the "baddest of the bad", going on to say, "You can print that. I want everyone to know."

Croitoru worked as a jobber to the stars, putting over such wrestlers as Pedro Morales, Tito Santana and Paul Orndorff. He wrestled in many tag team matches and formed a short-lived team with Barry O in 1986, but his biggest match in the WWF was a televised bout against Hulk Hogan.