George Orwell on the Republican Convention.

George Orwell's novel 1984 refers to the Big Lie theory on several occasions.
Here are two examples:

“The key-word here is blackwhite. Like so many Newspeak words, this word has two mutually contradictory meanings. Applied to an opponent, it means the habit of impudently claiming that black is white, in contradiction of the plain facts.”

“To tell deliberate lies while genuinely believing in them, to forget any fact that has become inconvenient, and then when it becomes necessary again, to draw it back from oblivion for just so long as it is needed."