In what year did the Supreme Court decide the Citizens United case?

The Supreme Court decided the Citizens United case in 2010. This landmark decision addressed the regulation of campaign spending by organizations and individuals, particularly focusing on the First Amendment rights concerning free speech. The ruling determined that corporations and unions could spend unlimited amounts on political campaigns, as long as the expenditures were independent of the candidates' campaigns. This decision has had a significant impact on the political landscape in the United States, leading to the rise of super PACs and an influx of money into electoral politics. The year 2010 is crucial as it marks the point when this substantial shift in campaign finance law occurred, thereby shaping the subsequent discussions and legal frameworks surrounding political contributions and free speech.