Repeat: The first is 501(c)(3) groups, which are charities that are supposed to have no involvement in partisan politics; the second are the 501(c)(4) groups, which are permitted to be a little more involved in the political process, with more latitude for lobbying and electioneering.
The first is 501(c)(3) groups, which are charities that are supposed to have no involvement in partisan politics; the second are the 501(c)(4) groups, which are permitted to be a little more involved in the political process, with more latitude for lobbying and electioneering.