Which U.S.Supreme Court case involved setting standards for effective assistance of counsel?

Question

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United States v. Cronic (1984) established the standards for what constitutes effective assistance of counsel. This case determined that a defendant who has been deprived of counsel through government action is presumed to have been prejudiced by that deprivation, and effective assistance of counsel requires more than just simply being present in the courtroom.

Which USSupreme Court Case Involved Setting Standards for Effective Assistance of of Counsel