Filing a lawsuit against a police officer and a police department for violating a federal civil rights law that allows citizens that have been wrongfully arrested to collect civil damages.You file a lawsuit alleging that a competing company has made a product that infringes upon your patent. Patents are a creation of federal law, so you may file your suit in federal court.A growing small business sues a large company for engaging in unfair and anti-competitive business practices under federal antitrust laws.An organization devoted to handicapped individuals sues a public establishment for failing to have any handicap accessible entrances under the Americans with Disabilities Act.