Super PACs: a big problem.
In the US, Independent Expenditure-Only committees, or Super PACs, raise unlimited sums of money from corporations, unions, associations and wealthy individuals, then spend the money to advocate for or against political candidates.
As of September 2018, 2,113 Super PACs have reported receipts of $700,282,356 and expenditures of $214,421,737 in the 2018 cycle (data here).
That’s big money. And it’s a big problem for the voting public, because it unfairly influences elections and disenfranchises individual voters.