You may remember the name Sheldon Adelson from the 2012 election. He was the casino mogul who donated $20 million to Newt Gingrich’s campaign. He’s been a generous donor to other conservative groups and causes. He donated at least $53 million in the last election, according to Forbes. Other sources put the figure even higher. He was a big conservative donor in 2008, too.

And, as it turns out, he has been put under a microscope by the Internal Revenue Service as well. The Sunlight Foundation, a nonprofit investigative journalism group, reported last year:

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