MONEYINPOLITICS.wtf
America’s most comprehensive dictionary of campaign finance jargon
527 organization
noun1 a political committee that discloses information about its finances predominantly to the Internal Revenue Service; donors can contribute an unlimited amount of money; typically not required to disclose its donors to state or federal election regulators; political activity is often detected when the organization's name appears in the content of political advertising; the name comes from section 527 of the tax code
Arizona and Michigan are also among a handful of competitive states seeing massive outside spending by the Republican Attorneys General Association, a tax-exempt 527 organization focused on electing GOP attorneys general.— Open Secrets