Step 1: Understanding the Question:
The question asks to categorize the countries that form the Non-Aligned Movement (NAM).
Step 2: Key Concept:
During the Cold War, the world was often divided into three groups:
- **First World:** The Capitalist bloc, led by the USA.
- **Second World:** The Communist bloc, led by the USSR.
- **Third World:** Countries that were not aligned with either bloc, mostly comprising newly independent, developing nations in Asia, Africa, and Latin America.
Step 3: Detailed Explanation:
The Non-Aligned Movement (NAM) was founded precisely by these "Third World" countries. They sought to maintain their independence and sovereignty by not aligning with either of the two major power blocs.
Therefore, NAM is an organization predominantly of Third World countries, which are typically developing nations.
Step 4: Final Answer
The group of Non-Aligned countries is an organization of Third World countries.