In which case did the U.S. Supreme Court rule that a defendant has a right to self-representation in state criminal trials?

The U.S. Supreme Court ruled in Faretta v. California that a defendant has the constitutional right to represent themselves in state criminal trials. This landmark decision established that the Sixth Amendment, which guarantees the right to assistance of counsel, also implicitly includes the right to pass up that assistance and defend oneself if the defendant chooses to do so knowingly and intelligently.

The Court recognized self-representation as a fundamental right that stems from the respect of personal autonomy and the ability of individuals to control their own legal defense. This ruling underscores the idea that while having a lawyer is crucial for a fair trial, the ability to choose self-representation is equally significant, reflecting the defendant's personal liberty and agency in legal proceedings.

In contrast to the other cases listed, Faretta is specifically centered on the right to self-representation, while the others address different aspects of defendants' rights or issues regarding legal representation.