You have heard of the draft riots in New York in 1862.

They would not fight for the Confederacy either.
During the following decade, in Pennsylvania, an association, called the Molly Maguires, terrorized the coal regions until their reign of assassination was brought to an end by the detection, conviction, and execution of their ringleaders.

These were Green Irish.
In Cork and Queenstown during the recent war, our American sailors were assaulted and stoned by the Green Irish, because they had come to help fight Germany.

These assaults, and the retaliations to which they led, became so serious that no naval men under the rank of Commander were permitted to go to Cork.

Leading citizens of Cork came to beg that this order be rescinded.