This chapter examines the Supreme Court's decision inPleasant Grove City v. Summum. In the city of Pleasant Grove, Utah, sits Pioneer Park—the site of a local controversy that launched a landmark expansion of the doctrine known as “government speech.” The park's attractions are a hodgepodge of monuments and historical markers, including a privately donated Ten Commandments monument. A small and unconventional local religious group called Summun argued before the Supreme Court for the right to place its own monument next to the Ten Commandments in Pioneer Park. At issue in the Summun case was whether and how the claimed government speech forum would apply to monuments in a public park. Beneath the surface of this issue, however, were some very fundamental First Amendment questions. The chapter focuses on these questions. Is First Amendment immunity for government speech constitutionally justified, and if so, why? Should government's choice of private speech qualify as government speech? Should government's speech power be extended to a government speech forum in which only approved ideas and viewpoints can be expressed?