I'm really sorry to get into an argument about semantics, but I mean, I think that definition reaches beyond genocide

political opinion, social status, or other particularity.

This seems to reach into other forms of political killing, or classicide.

gen·o·cide /ˈjenəˌsīd/

the deliberate killing of a large number of people from a particular nation or ethnic group with the aim of destroying that nation or group

This is usually what I perceive to be the meaning of a genocide. I don't see an ethnic or national thread between these people, they were prisoners and accused of anti-revolutionary activities. Their executions may have been unjust, but I disagree that they were motivated by any desire to exterminate their race or nationality