What is the main focus of an argumentative essay?

conclusion
introduction
thesis
claim

In an argumentative essay the main objective is to persuade, so I would say it's your claim, or your thesis statement. Throughout the essay you're working to prove your point and have the reader understand your point of view.

i think it's either 'to expose the corruption of the communists in russia', or 'to criticize animal brutality by communists in russia.'  

hope this ! : )

showing or having an insensitive and cruel disregard for others. (so basically being heartless)

hope this : )