Which contribution limits did McCutcheon v. Federal Election Commission strike down?

In the 2014 case McCutcheon v. Federal Election Commission, the U.S. Supreme Court struck down the aggregate limits on the total amount of money an individual could contribute to all federal candidates, political party committees, and noncandidate political action committees (PACs) during a two-year election cycle.12

The Court ruled that these aggregate limits violated the First Amendment protections for freedom of speech and freedom of association. It is important to note that the ruling did not affect the so-called base limits, which restrict the amount an individual can contribute to any single candidate or political committee; those limits remained in place and were not at issue in the case.21