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Shameful or Ignored Supreme Court Cases

McGrain v. Daugherty

1. What restrictions, if any, exist on Congressional investigations after McGrain?

2. What role does the judiciary have in policing against any abuses of Congressional investigation power? Can it intrude absent the physical taking of a witness into custody with a subsequent habeas action?

3. What relevance does this case have for the use of Congressional investigatory power and process in an impeachment inquiry?