The St. Louis Observer was an abolitionist newspaper established by Elijah Lovejoy, a New England Congregationalist minister, in St. Louis, Missouri. After the newspaper's printing press was destroyed for a third time by a pro-slavery mob, the newspaper was re-located to Alton, Illinois, and renamed the Alton Observer.
See also Abolitionism in the United States Elijah Lovejoy Alton Observer
References Vaughn, Stephen L. (editor) Encyclopedia of American Journalism (Routledge, 2009) p. 4