Ashe v. Swenson is a landmark Supreme Court case decided in 1970 that addressed the issue of double jeopardy, specifically the principle that a person cannot be tried twice for the same offense. In this case, the Court held that a second prosecution for a different offense arising from the same incident violated the Double Jeopardy Clause of the Fifth Amendment. This case underscores the protection against being tried multiple times for the same crime and reinforces individual rights within the legal system.