Opus Dei didn’t exist during the American Civil War.
As mentioned above, I don’t verify authenticity. cuil or yahoo “Roman Catholic Church” and “Lincoln Assassination”.
The Surratts, George Atzerodt, Michael O’Laughlen were all Roman Catholic and John Wilkes Booth was supposedly a convert. I personally find Booth’s conversion doubtful as he was a member of the Know-Nothing Party at the age of 16.