A country with a government that deliberately places socialist principles into action is

Communist, like China, is the right answer.

Explanation:

A state which is managed and governed by a single party on the principles guided by Marxism-Leninism, is known as a communist state. Marxism and Leninism ideology are adopted by a number of communist nations throughout the world, for example, China, Cuba, Vietnam and Laos. A single centralized party apparatus administers the communist states. This single party can place any principle of the rule in its state.

Therefore, a country that deliberately places socialist principles into action is Communist.