Absolutely.
Not everywhere of course. But in carefully selected precincts, the cheating is almost transparent.
Pay attention the next time an important vote is close; most of the time, there will be a handful of areas that are “late” or have “voting issues” or are ordered by judges to keep the polls open after their normal closing times.
They’re most always controlled by the party bosses.
Oh yes, that has happened, that form of “voter fraud”.