The terms Communist, Progressive and Liberal as used by the left, all mean the same thing. Let me explain why. Carl Marx in 1848 finished writing and then published the Communist Manifesto. Over the next 30 to 40 years the book gained some followers, mostly self anointed elites with PHDs. ( Now there is a subject worth some grant money. Why are highly educated people with PHDs so susceptible to such an absurd philosophy.) As people became aware of their agenda, the communists picked the term progressive in an attempt to hide that agenda. Years later, the same problem, to many people have spotted the agenda again so they picked the term liberal. ( Note that the dictionary definitions of progressive and liberal are very far removed from the political definitions.)
One of the goals of their agenda is to infiltrate and take control of both major political parties. The Democrat party is at this time wholly controlled, 90% to 95%. The Republican party is 40% to 45% controlled. This leaves WE THE PEOPLE with very little true representation inside the belt way. We need to flush the progressives from both parties.