Argued on November 12, 1968, and decided on February 24, 1969, Tinker v. Des Moines Independent Community School District established the principle that students had a right to self-expression, even within the context of the classroom. The case, which involved two high school students and one junior high school student, grew out of a protest the group—with the support of their parents—organized against the Vietnam War. Principals of the affected schools in the Des Moines school district learned about the planned protest and adopted a policy that threatened students participating in it with suspension.