How? Nothing about paying to keep people quiet here:
"No person, whether acting under color of law or otherwise, shall intimidate, threaten, coerce, or attempt to intimidate, threaten, or coerce any other person for the purpose of interfering with the right of such other person to vote or to vote as he may choose, or of causing such other person to vote for, or not to vote for, any candidate for the office of President, Vice President..."
Civil Rights Division | Title 52- Voting and Elections- Subtitle I and II (justice.gov