He was portrayed by Domenico Fortunato.
During the Day of the Dead parade at the Zocalo in Mexico City, Bond follows Sciarra to his destination at a building, where Gallo and several other men meet up with Sciarra. As it turns out, Gallo is involved in Sciarra's mission to blow up a stadium (ordered by Ernst Stavro Blofeld) in order for the Mexican Government to take part of the "Nine Eyes" anti-terrorist program led by Max Denbigh. Gallo also learns that Sciarra is going to finish off Mr. White after the mission is done.
However, when the two men raise their glasses, Gallo sees Bond outside the window. He tries to reach for his gun, but Bond just shoots Gallo in the head, killing him instantly. Sciarra then escapes the building by blowing it up, though he would later suffer Gallo's fate after being thrown to his death from a helicopter by a pursuing Bond.