In Bangladesh's chaotic industrial center, perhaps no one wielded power more brazenly than Sohel Rana. He traveled by motorcycle, as untouchable as a mafia don, trailed by his own biker gang. He allegedly was involved in illegal drugs and guns, but he also had a building that housed five factories. Upstairs, workers earned as little as $40 a month making clothes for global retailers. Now Rana, 35, is under arrest, the most reviled man in Bangladesh after the horrific collapse of Rana Plaza last week left nearly 400 people dead, with many others still missing.