MOSCOW—They call themselves The Night Wolves, “a new kind of motorcycle club,” or, sometimes, “Putin’s Angels.” And just as much as the Orthodox Church or the military, the Wolves have become a symbol of Vladimir Putin’s Russia. But the idea that they might be used as his extra-legal enforcers in times of trouble is usually implicit—embedded in their flag-waving Putinized patriotism—never really spelled out.

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