This is a story about how a savvy company came to Chicago and raked in more than $50 million in contracts from the school system in just four years, becoming one of the district’s biggest vendors. Camelot Education runs six small schools that re-enroll high school dropouts or students who have been expelled. It’s a service the city needs, the school district insists, and by most accounts Camelot runs solid programs that are making a difference for some troubled teens. But Camelot is also a for-profit company willing to play ball to get contracts, school buildings and students. The Austin, Texas-based company’s growth in Chicago is a textbook example of how private companies are working the system in Chicago.