The act addressed in Article I of the Constitution that is a limit of Congress's ability to declare a person guilty of a crime without trial is: Habeas Corpus.
<h3>What is Habeas Corpus?</h3>
Habeas Corpus is a law that states that a person who is accused of a crime must be tried before being convicted of the crime.
It is in line with Article I of the constitution which describes the structure of the legislative government. Congress is charged with the making of laws in this first article.