Expulsion from the United Nations
Expulsion from the United Nations is a procedure under Article 6, Chapter II of the United Nations Charter when a member state of the United Nations can be expelled from the organization. This can be done when a member state has persistently violated the principles of the United Nations Charter. No state has ever been expelled from the UN, although the exclusion of the Republic of China (replaced by the People's Republic of China) through General Assembly Resolution 2758 and the suspension of South Africa due to its apartheid laws had a similar effect.
Separately, Article 5 of the Charter allows for suspension of a state's membership through the same procedure.