Philip McGrade was attending an Alcoholics Anonymous meeting over the videoconferencing service Zoom when a message suddenly appeared on the screen. “Hitler did nothing wrong,” it read. Next, scenes from Leni Riefenstahl’s Nazi propaganda film “Triumph of the Will” started playing. A person yelled “Allahu akbar,” and pornography popped into view. He logged out, joined a different AA meeting and within a few minutes a similar attack began there, too.

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