An authoritarian right-wing dictatorship by any standard, but like any polity it had its own internal conflicts. Of moment for this date: the detention of people whom the Legions considered implicated in the execution of fascist martyr Corneliu Zelea Codreanu two years before, as well as miscellaneous other undesirables who had prospered under the abdicated King Carol II.
Antonescu, who had a thing about rectitude, proposed to ornament these men’s inevitable deaths with the formalities of investigation and trial. Long story short, Sima and the Legionaries didn’t trust Antonescu; when Antonescu ordered some of the prisoners transfered to a different prison, the Guard refused — and when replacement jailers were consequently slated for the Guard, the Guard took matters into its own hands by slaughtering its charges this night.
Antonescu was furious.
the handful of reprobates who have committed this crime will be punished in an exemplary manner. I will not allow that the country and the future of the nation be compromised by the action of a band of terrorists … I was reserving the punishment of those held at Jilava for the justice system of the country. But the street decreed otherwise, proceeding to implement justice itself
By the following January, the conflict between the National Legionary State factions came to a head. With the support of the Third Reich, Antonescu mastered the Iron Guard, took control of the state, and sent Sima into exile.
And he did indeed punish — up to and including execution — several of the Guard members involved in this date’s massacre.
On the other hand, as a prize for serving as wartime Prime Minister of an Axis-aligned state, Antonescu himself was shot for war crimes not far from Jilava Prison in 1946. Sima, on the other hand, had a few in absentia death sentences, but checked out comfortably in Madrid at the age of 85.