“Kim Jong-un may have executed one of his closest aides according to a Seoul-based think tank. According to North Korea Intellectuals Solidarity (NKIS,) earlier this month Kim Kyong-ok, the First Deputy Director (First Vice Director) of the Organization and Guidance Department [OGD] of North Korea’s ruling party was executed along with some of his aides. The OGD is widely believed to be among the most powerful institutions within the DPRK state, and some defectors and North Korean experts argue that the OGD actually controls Kim Jong-un himself.”
Source: Report: Kim Jong-un Executes Another Powerful Aide | The Diplomat