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Sens. Tom Harkin of Iowa and John Kerry of Massachusetts -- who, in an ironic twist, is now on the other side of the fence, working as Secretary of State to strike a deal with Iran -- actually traveled to Nicaragua to meet publicly with Daniel Ortega, the communist leader. Were they “traitors”? Were they trying to “make common cause” with the communists?

Yes, they were. Kerry did even worse prior to that so he's a two time traitor.

American Patriots Against John Kerry
The 1970 meeting that John Kerry conducted with North Vietnamese communists violated U.S. law, according to an author and researcher who has studied the issue.
Kerry met with representatives from “both delegations” of the Vietnamese (North Vietnamese and Viet Cong) in Paris in 1970, according to Kerry’s own testimony before the Senate Foreign Relations Committee on April 22, 1971. But Kerry’s meetings with the Vietnamese delegations were in direct violation of laws forbidding private citizens from negotiating with foreign powers, according to researcher and author Jerry Corsi, who began studying the anti-war movement in the early 1970s.
According to Corsi, Kerry violated U.S. code 18 U.S.C. 953. “A U.S. citizen cannot go abroad and negotiate with a foreign power,” Corsi told CNSNews.com.
By Kerry’s own admission, he met in 1970 with delegations from the North Vietnamese communist government and discussed how the Vietnam Warshould be stopped.