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In 2015, Al-Jazeera’s Investigative Unit had a question: what did the National Rifle Association say about mass shootings behind closed doors?

To answer it, they planned a lengthy undercover investigation, in which a reporter posed as an Australian gun lobbyist to infiltrate meetings with the NRA and with One Nation, a far-right, anti-immigration party.

The result, released in a two part documentary that aired on the Australian Broadcasting Corporation, is — at the very least — compelling.