What steps were taken by harry truman to investigate communist influence in the u. s.?

There were several steps that were taken by Harry Truman to investigate communist influence in the United states. The first step taken was the creation of the Smith Act that prohibited the communist party from teaching their principles in the country. Many stage actors were also arrested due to the fact that they had ties with the communist party. 

The question of what caused the full effects of the radical stage, also called the second french revolution by some historians, which shook the political and social reforms in france have caught the attention of many scholars, particularly because of principles implemented during this stage which is contradictory to the fundamental principle of the french revolution itself, by using dictatorship to create equality.