By Dave Levinthal and Sarah Kleiner, The Atlantic, September 18, 2018

Secret money in politics will soon be a lot less secret. The Supreme Court on Tuesday let stand a lower-court ruling forcing politically active nonprofit groups to disclose the identity of any donor giving more than $200 when those groups advertise for or against political candidates.

Until now, such nonprofit organizations—generally those of the 501(c)(4) “social welfare” and 501(c)(6) “business league” varieties—could keep their donors secret under most circumstances.

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