The early American Communists, a North Vietnamese tunneler who helped outsmart the Americans and win the war in Vietnam, plus the pyramid scheme failure in Albania which left gun-toting children on the streets. Also how five American missionaries paid the ultimate price after seeking out a remote tribe in Ecuador but left a lasting legacy, and the petition signed in Czechoslovakia which helped bring about the end of communism.

Photograph: Ella and Bert Wolfe (courtesy of the Hoover Institution Archives