At 15, he and a group of friends were known for patrolling the streets of their neighborhood and physically attacking black people on sight, including a group of schoolchildren and their teacher. The crime that landed him a felony stint in prison was robbing a Vietnamese man and beating him unconscious. Wahlberg had his Hollywood-style epiphany moment when he was fleeing the police and another Vietnamese man offered him sanctuary. If this were a movie, this would have been the part where he learned that we're all just people, and he would have later helped the man open a Pho shop. This was not a movie, so Wahlberg called him a gook and smashed his face.
Prison scared the shit out of Wahlberg. He was a five-foot-three, 16-year-old kid who weighed about 125 pounds, surrounded by people who could probably fold him in half. It was during this time that he started working out for self protection, beginning to build the body that would make him a famous rapper -- because, c'mon, it's not like he was famous for the music.
Unless you somehow agree with him that his vibrations are "good like Sunkist."
When he was released 45 days later, his brother Donnie helped him put together Marky Mark and the Funky Bunch. Their first album went platinum, and he had his first number-one hit with "Good Vibrations." A few years later, he got his acclaimed film role in Boogie Nights, dropped the nickname and the music career, and (as far as we can tell) hasn't committed a hate crime since. Unless you count Entourage.