A defendant who pleads guilty waives a variety of constitutional rights. Which Supreme Court case ruled that this waiving of rights must be done knowingly, intelligently, and voluntarily?

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Johnson v. Zerbst (1938) established that a defendant's waiver of constitutional rights (in this case, the right to counsel) must be done knowingly, intelligently, and voluntarily. This principle has been applied broadly to the waiving of various constitutional rights, including those waived when a defendant pleads guilty.

A Defendant Who Pleads Guilty Waives a Variety of Constitutional