The premiere


I'll check Wikipedia, but one of IMDb reviews has:

At this movie's London opening, Godard was incensed at his producer's unauthorised changes. Godard suggests the audience ask for their money back. Donate it to Cleaver's defense fund, he says. (Black Panther Eldridge Cleaver had just gone underground.) The London audience dissents. Godard calls them fascists. A melee ensues. Godard punches the offending producer who, ironically enough, played a fascist porno bookseller in the film.

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