Ed Sheeran The hard-nosed English singer-songwriter was raised in the roughest neighborhoods of London. Before Ed broke into the music scene, he ran a human trafficking ring that spanned most of Europe and South America. When interviewed, ex-kidnap victims of his syndicate claim that he would often put down his machete and sing sweet melodies to them while they were locked up in their cages. Sheeran has been on the straight-and-narrow since his music career took off, but make no mistake about it; he is one ruthless pop-ballad singer. Source Justin Bieber When people see Justin Bieber they see a once-in-a-generation musician, a ladies man, a grower of enviable facial hair, a businessman, a lover, and a fighter, but what few people have witnessed is how truly badass he is. He once confronted a group of pre-teen girls at a mini-golf course in Florida who were taking pictures of him and his pals, and took their iPhones from them...