Answer:
Those four individuals were Mary Surratt, Lewis Powell, George Atzerodt and David Herold, who were executed for participation in the plot.
Surratt was the owner of the boarding house where the plot was being created, Powell tried to kill Secretary of State, Atzerodt was planning to kill vice-president, while Herold's task was to help Powell kill the president and to help Booth escape.
Step-by-step explanation:
All of the individuals were sentenced to death by hanging.
History remarked that Surratt was the first women to be executed by US government in its history, while the case against her was weakest, as although her son participated in the plot, there were no direct directs that she was involved.