OK, time has elapsed so I'll have another go. There is one word to be found.
Undercover police activity has become a standard feature of the contemporary political terrain. Disclosures in recent years indicate that environmentalist, anti-nuclear and animal rights groups are likely to be targeted for surreptitious investigation. This can take many forms, from an inconspicuous stranger who turns up to help at a demonstration, to a trained "deep cover" operative who may spend many years working within an organization.
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