527 groups

A 527 organization or 527 group is a type of U.S. tax-exempt organization organized under Section 527 of the U.S. Internal Revenue Code (26 U.S.C. § 527). A 527 group is created primarily to influence the selection, nomination, election, appointment or defeat of candidates to federal, state or local public office.

Technically, almost all political committees, including state, local, and federal candidate committees, traditional political action committees, "Super PACs", and political parties are "527s." However, in common practice the term is usually applied only to such organizations that are not regulated under state or federal campaign finance laws because they do not "expressly advocate" for the election or defeat of a candidate or party.

There are no upper limits on contributions to 527s and no restrictions on who may contribute. There are no spending limits imposed on these organizations. The organizations must register with the Internal Revenue Service (IRS), publicly disclose their donors and file periodic reports of contributions and expenditures.

Because they may not expressly advocate for specific candidates or coordinate with any candidate’s campaign, many 527s are used to raise money to spend on issue advocacy and voter mobilization. Examples of 527s are Swift Boat Veterans for Truth, Texans for Truth, The Media Fund, America Coming Together, the Progress for America Voter Fund, and the Secretary of State Project.

...
Wikipedia