General Discussion
In reply to the discussion: MI-GOV: Abdul continues his daily scorched earth attacks against Whitmer. [View all]lapucelle
(20,950 posts)527s are advocacy groups. They are required to disclose donor information to the IRS, but not to the FEC.
It is 501(c)(4)s that are considered to be dark money groups because they are not required to disclose their donors to either the IRS or the FEC. (They can raise unlimited amounts of cash from individuals and organizations alike without having to disclose who contributed that money.) Examples of 501(c)(4)s are the NRA, Crossroads GPS, and Our Revolution.
https://www.opensecrets.org/527s/index.php
https://www.opensecrets.org/527s/basics.php
https://sunlightfoundation.com/2016/08/26/bernie-sanderss-new-political-group-wont-have-to-disclose-its-donors/
https://sunlightfoundation.com/2016/02/17/a-glossary-of-campaign-finance-in-the-u-s/#501(c)(4)
https://sunlightfoundation.com/2016/02/17/a-glossary-of-campaign-finance-in-the-u-s/#501(c)(4)