On this date in 1979, the American Broadcasting Company journalist Bill Stewart was executed at a somocista checkpoint during Nicaragua’s bloody civil war. And what is more, the deed was caught on film — pre-emptively balking the crumbling Nicaraguan dictatorship of the ability to, say, blame the killing on the Sandinista rebels. Stewart was stopped in a marked press vehicle in Managua, ordered to lie down, and then kicked and shot through the head while colleagues looked on. Though his summary execution by national guardsmen was taped by fellow journos in the convoy, the reasons for it are well into...