The answer is: The accused have a right to a clearly defined legal process.
The Sixth Amendment of the Constitution remarks on the legal process and all the rights that the accused possess if he/she were to stand trial. In this sense, this amendment defines the most important aspects of a legal process, which in this case are:
Right to a speedy trial
Right to a fair jury
Right to an Attorney or to represent oneself
Chance to bear witness to who is accusing him