Who is Lee Harvey Oswald from The Tears of Autumn and what is their importance?

Oswald is an ex-U.S. Marine who defects to the USSR, later returns to the U.S., and wants to help foment revolution in Latin America. Oswald is eventually approached by Manuel Ruiz about changing history by killing President John F. Kennedy. Seizing the bait, Oswald assumes he will be whisked to safety, does his duty, and is arrested without knowing that the vengeful South Vietnamese are behind his deed. He is gunned down by Jack Ruby on orders from the KGB. Everyone who talks about Oswald put him down as an outsider, clown, idiot, and even "faggot."