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By “guerrilla tactics,” the author means video-documentation of animal cruelty.
https://www.nytimes.com/2018/05/25/world/europe/france-animal-rights-foie-gras.html

Scorned, Animal Rights Advocates in France Intensify Guerrilla TacticsAs lawmakers backtrack on vows to improve animal welfare, one group is turning to clandestine videos in an attempt to shock Parliament into action.