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In page Legal observer:
"It is thought that the concept of using legal observers first emerged during protests in the 1930s in the East End of London, where police agents provocateur were used during protests by the British Union of Fascists (BUF).[citation needed] There were large counter-protests and it was alleged that the police sided with the BUF. Another case of legal observing was that carried out by the Black Panthers in the United States.[citation needed]
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