Thread: What ways has Congress tried to legislate limitations on the influence of interest groups?

Basically I tried looking it up but I can't find it and I just need three examples! (My book doesn't have the answer because my teacher uses mostly online resources, this being one of them).

Heres the exact question: List three ways that Congress has tried to legislate limitations on the influence of interest groups.

The only one i know of is the Hatch Act, which put limitations on PAC's contributions to federal campaigning ads.