Sean Aloysius O'Brien was a male Human coal mine worker on Earth in the late 19th century and 1900s. He was an ancestor of Miles O'Brien.

He was born in the 19th century and was a union leader in Pennsylvania in 1902. Sean and a group of employees went out on strike against the owners of a coal mine and refused to open the mine until their demands were met. He made the ultimate sacrifice for his union: he was found dead in the Allegheny River with 32 or 34 gunshot wounds in his body a week before the strike ended.

In 2372, Chief O'Brien told Rom about Sean O'Brien, after Rom formed a union of bar employees to fight his brother Quark's unfair labor practices. Rom remarked that this was not a very encouraging example. O'Brien was proud of his ancestor, as he "was a union man". (DS9: "Bar Association")

This character was only mentioned in dialogue.
According to the script, his first and middle name were pronounced as "SHAWN al-oh-WIH-shus". [1]
The actual leader, as noted by the Star Trek Encyclopedia (4th ed., vol. 2, p. 96), of the 1902 anthracite strike was United Mine Workers' president John Mitchell.

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