"Citizens United v. FEC" is a landmark Supreme Court case decided in 2010. The case involved the nonprofit organization Citizens United, which challenged federal laws restricting political spending by corporations and unions. The Court ruled that these restrictions violated the First Amendment's guarantee of free speech, allowing for unlimited independent political expenditures. As a result of this decision, corporations and unions can spend unlimited amounts of money on political campaigns, as long as the spending is not directly coordinated with a candidate's campaign. This ruling has significantly impacted the landscape of American politics, leading to the rise of Super PACs and increased influence of money in elections.