(covers information from several alternate timelines)
Nicky Giorgo was a Human mechanic who lived in 20th century New York City, during World War II.
In an alternate version of 1944, Nicky was a friend of Carmine, a leader of the resistance against the occupation of America by the Nazi/Na'kuhl alliance. When Carmine was wounded in the leg, he had his wound dressed by Nicky. Upon viewing the dressing, Alicia Travers, another resistance fighter, told Carmine that "he should stick to cars," before redressing it herself.
Later, when Carmine and his associates assisted Jonathan Archer attack Vosk's compound, Nicky was ordered to lay down some covering fire for Archer and Trip Tucker, who were attempting to escape from the building. Nicky shot at the Nazis until Archer and Tucker got to safety. (ENT: "Storm Front, Part II")