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The original was posted on /r/todayilearned by /u/Knightbuster on 2024-06-23 11:33:08+00:00.

Original Title: TIL FBI added Oppenheimer to its Custodial Detention Index, for arrest in case of national emergency after they found that Oppenheimer was on the executive committee of the American Civil Liberties Union, which it considered a communist front.