Koppel is a Communist political organizer, a native of Argentina who grew up in the United States. Koppel first became involved in political activism while an exchange student in Marseille, France. The next year, in 1977, he joined the Socialist Workers Party in Baltimore.
He has been active in defense of the Cuban Revolution, and was a longtime supporter of Puerto Rican independence. Koppel has also traveled extensively in Latin America and the Caribbean to take part in political conferences and meet workers and peasants, from the Movement of Rural Landless Workers in Brazil to working class protests in Argentina, Mexico, the Dominican Republic, Nicaragua, and Grenada.
In 2004, Koppel ran for the US Senate seat from New York against Chuck Schumer. He received 14,811 for 0.2 percent of the vote.
In 2006 Koppel ran for attorney general of New York. He received 10,197 votes, for 0.2 percent of the total vote.