A fellow traveler is someone who shares a common goal or ideology with another person. COMRADE is a term used to refer to a close friend or ally, usually in a political context. Seatmate is someone who is seated next to you, often on a plane or train. Pinko is a slang term for someone who holds left-wing political views. ABETTOR is someone who helps or encourages another person to do something, often something illegal or wrong. CONFEDERATE is someone who is united with another person, especially in a political or military alliance.