The ‘Citizens United’ decision and why it matters
In a nutshell, the high court’s 5-4 decision said that it is OK for corporations and labor unions to spend as much as they want to convince people to vote for or against a candidate. The decision did not affect contributions. It is still illegal for companies and labor unions to give money directly to candidates for federal office. The court said that because these funds were not being spent in coordination with a campaign, they “do not give rise to corruption or the appearance of corruption.”
So if the decision was about spending, why has so much been written about contributions? Like seven and eight-figure donations from people like casino magnate and billionaire Sheldon Adelson who, with his family, has given about $40 million to so-called “super PACs,” formed in the wake of the decision?
For that, we need to look at another court case — SpeechNow.org v. FEC. The lower-court case used the Citizens United case as precedent when it said that limits on contributions to groups that make independent expenditures are unconstitutional. And that’s what led to the creation of the super PACs, which act as shadow political parties. They accept unlimited donations from billionaires, corporations and unions and use it to buy advertising, most of it negative.
https://www.publicintegrity.org/2012/10/18/11527/citizens-united-decision-and-why-it-matters