Hinton Helper's scheduled lecture postponed in New York City due to fears of mob action
Hinton R. Helper, the controversial author of The Impending Crisis was scheduled to give a lecture at the Clinton Hall in New York City but the proprietors decided to call the talk off "owing to the excited state of the public mind." A small anti-Helper and pro-South crowd had gathered nevertheless and took some time to disperse. The New York Police Department made one arrest. (By John Osborne)
"Mr. Helper's Lecture Postpones; the Reason, Disorder and an Arrest," New York Times, January 15, 1861.