An undercover cop who infiltrated leftist and anti-capitalist activist groups blew his cover in 2004 when he accidentally dialed one of the activists during a secret police meeting and recorded himself answering questions about the activists.

When the cops realized his mistake, they debated if they should "mount a destructive operation" against the activist groups

https://www.theguardian.com/uk-news/2026/mar/22/undercover-police-officer-exposed-by-his-own-blunder-spycops-inquiry-hears

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