Final answer:
The ruling of Faretta v. California affirmed that a defendant has the right to self-representation in court upon a knowledgeable and voluntary waiver of the right to counsel.
Step-by-step explanation:
The rule or holding of Faretta v. California was that defendants have the right to represent themselves in court if they knowingly and intelligently waive their right to counsel. This decision emphasizes that while defendants are entitled to legal representation, they also have the right to self-representation under the Sixth Amendment if they choose to do so and are fully aware of the consequences. The Supreme Court’s ruling ensures the protection of the constitutional rights of the accused, including the right to mount their own defense without an attorney if they competently decide to do so.