system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Citizens United v. Federal Election Commission

The court case and the outcome from the ruling.
gpt
It used to be that corporations were allowed to run things called **Issue Ads**, but were not allowed to support actual candidates.  So they could run an ad saying, "Support Solar Energy" but not "Support Candidate 'A.'"

Citizens United decided that this was an unreasonable restraint on a corporation's and union's rights and that they should be able to spend money in support of candidates.  This has angered a lot of people who feel that the decision opened yet another door by which corporations can influence elections and buy favor with candidates.  An influence that individuals can't match.

However, direct contributions from Corporations and Unions direct to candidates' campaigns were not in question and are still banned under current law.