Here is a This American Life episode about just such a real-life group of people: a collection of various chemical company executives arranging and implementing an international price fixing scheme that lasted years.

The episode focuses on an informant, a junior executive with one of the companies, who captured an enormous amount of footage of the executives jovially discussing the various ways and means they'd be using to knowingly screw over their customers and, in turn, a great deal of the agricultural and industrial economies that depended on their products. The footage is justly described as "probably the most remarkable videotapes ever made of an American company in the middle of a criminal act".

Everyone has reasons for the things they do, post-hoc or otherwise; I think what distinguishes a villian is a callous acceptance of their own selfishness and a pointed indifference to, or even enjoyment of, the suffering inflicted upon others due to their actions.