Independent political action committees (both PACs and Super PACs) need to report their spending to the FEC, tied to the candidate their independent expenditure

Independent political action committees (both PACs and Super PACs) need to report their spending to the FEC, tied to the candidate their independent expenditure is in favor of/support. That covers most political spending on the national level. Political spending for state offices (which dont have to report to the FEC) is a whole other story.