The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The positive and negative effects of the United States foreign policy’s efforts to root out communist influences in the decade following World War II are the following.
The positive side is that during the Cold War years, the United States federal government tried to keep communism off the United States territory and instilled the foreign policy of containment to avoid or limit the spread of communism around the world.
For instance, President Harry S. Truman did everything that was in his hands to stop the spread of communism when the Soviet Union tried to spread its totalitarian ideas in many parts of the world such as in North Korea, North Vietnam, and Cuba.
On the negative side, that communist persecution created fear in the United States that turned into psychosis during the Red Scare times, a period in US history when Wisconsin Republican Senator Joseph McCarthy accused many members of the US federal government and the military to have ties with communists.
McCarthy just accused but never showed any evidence.