The term that best describes a government intervention in a market is "Regulation." Regulation refers to rules or laws that the government implements to control or manage the way businesses operate within the market to achieve specific outcomes, such as protecting consumers, ensuring fair competition, and safeguarding the environment.
Other terms like "Nationalization" refer specifically to the government taking ownership of private enterprises, while "Command" could imply a more authoritarian approach to governance. "Politicization" usually refers to the process of making something political in nature rather than describing a specific government intervention.