The privileges and immunities clause of the constitution prohibits one state from violating the rights of a citizen from another state
The U.S. Constitution explicitly states: “No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States.”
The Privileges and Immunities Clause protects all citizen’s fundamental rights no matter their state of residency. The purpose is to encourage cooperation and comity between citizens of different states.