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In the US, a political action committee (pac) is an organised group that raises money in order to support or defeat a candidate or issue in an election. Some pacs are associated directly with a campaign or politician, some are associated with a corporation or union and others are completely independent.
The rules and regulations that govern where a pac’s money comes from and how much it can raise – there is a $2,500 donation limit – are strictly monitored by the Federal Election Commission. However, the fundraising landscape was fundamentally altered by the Citizens United Supreme Court decision in 2010, which paved the way for the creation of super-Pacs.