Beattie, famed for her telephone calls to family in the series of television adverts, features in a video warning that the Labour leader has an “an ology” in extremism.
In the film she also raises fears that Mr Corbyn’s plan to nationalise the internet will mess up her broadband after she has finally got the hang of video-calls with her grandchildren.
Speaking on the phone to friend Nora, the Jewish star tells a friend: “Of course, we were all Labour, everybody voted Labour. I voted Labour all my life.
“You know what my late husband said? If you’re Jewish, they gave you your Labour Party badge the day after your circumcision. They gave with one hand, they took with the other.
“But this lot… this lot’s not Labour. They’re not socialists. You know what they are, Nora? They’re extremists, that’s what my Melvyn says, and he’s not often wrong.
“Then there’s the throwing around of the millions of pounds. Where’s he going to get that from?”
The Coronation Street star was renowned in the 1980s and 1990s for the advertisements, including one where she told her grandson that she was proud he had got “an ology” in sociology despite failing his other exams.
The video was produced by the Mainstream campaign launched by former Labour MP Ian Austin, who has said he will vote for Boris Johnson to stop Mr Corbyn taking power.
He said: “People like Jeremy Corbyn and John McDonnell have spent decades working with and defending all sorts of extremists and in some cases terrorists and antisemites.
“Under their leadership, Labour has been poisoned by racism, extremism and intolerance. They can’t be trusted to defend our country and they can’t be trusted with our democracy. A government led by them would mean other extreme policies like massive tax rises, alongside daft ideas like giving free broadband to people who can already afford it.”
