Watching President Barack Obama hang out with Cuban “president” Raul Castro immediately triggered a question in my mind: How many innocent people were murdered during Fidel and Raul Castro’s brutal Cuban experiment in socialism? An exact number is hard to find, and available data does not include human suffering due to lack of food and basic services. But the consensus is stark: In his authoritative book “Power Kills,” R.J. Rummel estimates that the Castro regime murdered some 77,000 to 141,000 innocents, including deaths by firing squad and other executions, disappearances, and “extrajudicial killings.” This estimate likely does not include some...