This article explores the phenomenon of the sedition trial in the early history of the Spanish American republics, focusing on sedition trials that occurred in Santiago de Chile from the late 1820s to the early 1850s. Sedition trials were governed by laws enacted in the wake of Chile's political independence to protect and regulate the freedom of the press. Because of the way press laws were written, sedition trials were conducted in front of juries composed of active citizens. As such, they constituted a dramatic break with the judicial tradition of Spanish colonial rule. The article argues that sedition trials were instrumental in the dynamics of political conflict, but only when the national government allowed them to operate without interference, which was not always the case. When sedition trials had integrity, as they did for a period in the 1840s, they became a public space in which citizen-journalists and publishers participated in establishing the boundaries of political speech. However, as one might expect, government officials also used the charge of sedition to silence their opponents. Sedition trials can thus be seen as a form of political warfare that has not been fully appreciated by scholars.