DISCLAIMER: I don't own Naruto or X-men Characters. Naruto belongs to Masashi, Kishimoto
When Victor Creed's mutation first manifested, he killed his "foster" brother over a piece of pie. His father would systemically pull out Victor's "devil teeth" in an attempt to purge the boy of his demons. Victor was chained like an animal in the family cellar for years until one day he chewed off his own hand in order to break free, subsequently murdering his father. His mother, though, was dying of cancer, so Victor took her to the hospital. She was killed a few years later by a member of the Red Right Hand.
Freed from his parents, Victor was unleashed upon society. At age thirteen, he reportedly rampaged across three Canadian provinces and killed at least three police officers. According to Creed, he remained in Canada and, at about fifteen, worked for the railroad, laying down rail from Calgary up to the Yukon. (The Canadian Pacific Railway reached Calgary in 1883 and the route up to the Yukon was completed around 1900. (If Victor Creed was 15 while laying rails that would place his birth between 1868 and 1885.) Among the workers on the line was a belligerent older man who delighted in picking on the teenage Creed. Though the man "had a hundred pounds on him," Creed gutted him from crotch to Adam's apple with his claws.
In 1912. During Silas Burr's trial, a gun battle broke out and he was taken away by one of the bailiffs, a man eventually known as Sabretooth. Sabretooth took him up to Canada, where he met a man who needed his services, a man by the name of Hudson.
Although certain memories of their encounters have been tampered with, it appears Sabretooth did attack a Blackfoot tribe Wolverine was a part of. The main victim was Silverfox. Creed coerced Wolverine into attacking another tribe.
In a later occasion, Sabretooth became involved with a group responsible for the killing of Wolverine's wife Itsu and the abduction of her son. These events have been uncovered by Wolverine's recent regain of his full memory.
Sometime in the mid-60's, apparently, Creed, now code-named Sabretooth, was a member of a special black ops group, along with Wolverine and Maverick. One of their missions was to steal the carbonadium synthesizer from Russia, which led them to meet Omega Red and force him into hibernation. Sabretooth was a cold operative, willing to sell out his teammates to save himself and the mission.
While on a mission in Germany, Creed was assigned to guard Leni Zauber, a German spy. The two became intimate, and Zauber eventually gave birth to a child, whom Creed never knew until years later, just as he didn't know that Leni was actually (Kushina) Mystique. Creed was then abducted into the original Weapon X Program, which was attempting to create super-powered sleeper agents. Part of the program was brainwashing and memory-implanting, performed by the Psi-Borg and using elaborate movie sets. It seems that unlike some of the other recruits, Sabretooth seems to have already had his claws and anti-aging factor. However, he did not receive the adamantium bonding that Wolverine did.
He fought against the martial artist Iron Fist. Shortly thereafter, Creed was recruited into the Marauders by Gambit on behalf of Mister Sinister, and led the villains in the Morlock Massacre. It was there that Wolverine first encountered Sabretooth in their costumed personas. Sabretooth escaped Wolverine's vengeance, and attacked the Mansion, but was beaten off by new X-Man, Psylocke.