Legal Question in Criminal Law in California

Its a violation of any of a number of rights including to be represented by counsel.

The Sixth Amendment to the United States Constitution provides:

In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and district wherein the crime shall have been committed, which district shall have been previously ascertained by law, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the Assistance of Counsel for his defence.

As you can see, there are several rights created by several "clauses." You will have to be more specific as to which one has been violated.