"Riana Pfefferkorn, associate director of Surveillance and Cybersecurity at the Stanford Center for Internet and Society, points out old-fashioned gum shoe work still has value.
"Right now, when researchers/law enforcement/etc. want to keep tabs on groups that use private messaging channels (to organize, plot, etc.), they infiltrate encrypted chat channels (e.g. Telegram) so that they can observe, as 'plainclothes' participants, the activity of others in the channel," she wrote."