The Sixth Amendment consists of five principles that influences the rights of a defendant in a criminal procedure and these are the following:
1. Speedy and Public Trial
2. Impartial Jury - In most cases, the defendant has a right to a jury.
3. Notice of the charges
4. Confronting and calling witnesses
5. The right to an attorney
Due process is the right of a criminal to go through the process of conviction. This is especially demonstrated through the police line "all criminals are innocent until proven guilty in the court of law". If the constitution did not guarantee this right, then the police could arrest anyone. Hope this helps! Let me know if you have more questions!