Where is this "information" coming from?
My understanding is that official Republican and Democrat poll monitors are present in virtually equal numbers. In a close election the ballots will be closely examined and recounted if there is any question re their legitimacy. But it would be a waste of time, other than for statistical purposes, if the outcome could not be affected. Why would the election results be far different than the polls indicated? As it is, the results are very much in line with the polls. That does not suggest skulduggery. (There were those saying that the results were different from the polls, but that was before the votes were counted!) In this election, in some states, the mail-in ballots exceeded by a wide margin the election day voting, and the breakdown of mail ballots is different from the same day vote breakdown. That's also consistent with what we've learned about the voters who favor mail-in balloting over showing up at a polling place.
I continue to be amazed at how accurate, on average, modern polling has become. It can't always accurately predict the electoral college in some cases because of winner take all rules affecting close races in key states where polling shows ties within statistical error. But other than that, insurmountable challenge for the polls, polling seems surprisingly accurate. If there is any significant election fraud going on it should be revealed by in disagreement with the poll averages, shouldn't it?