United Kingdom

The GOP sleazebags like Roger Stone called it “ratfucking” in the 1970s.Ratfucking" was a term used by Richard Nixon's campaign insiders to describe electoral fraud and dirty tricks they used against their opponents. The term was coined by political operative Don Segretti, who claimed it had come from his college days when he stuffed ballot boxes for student government candidates. Segretti was hired by the Committee to Re-elect the President (CREEP) to work his ratfucking magic for Nixon in the 1972 elections

Seems like the Brexiteers have adopted the tactic.