Which of the following actions would be a violation of an individual's civil rights?

Arresting a suspect without cause represents a violation of an individual's civil rights because it undermines the legal principle that individuals are presumed innocent until proven guilty. In order to make an arrest, law enforcement must have reasonable suspicion that a person has committed a crime, or sufficient probable cause to believe that an offense has occurred. If a suspect is arrested without any basis for such action, it infringes on their right to due process and protection against unlawful seizure as outlined in the Fourth Amendment of the U.S. Constitution. This action can lead to false imprisonment and a potential abuse of power by law enforcement officials, thus constituting a significant civil rights violation.