They are Communists.
They are trying to cause a revolution and overthrow/subversion of our government and way of life.
Read about the Russian Revolution of 1917 and also Communist activity (Red Scare) in the United States during the 1920s and 1930s.
Lenin called the educated liberals in Russia who gave support to the Communist takeover "useful idiots".
They were promptly rounded up and executed after the revolution.