The only thing "extreme" her Aus is your ignorance (lack of knowledge) about this topic.
They are the same and they are in practice today by the socialist democrat party.
In Marxist theory, socialism, lower-stage communism or the socialist mode of production, refers to a specific historical phase of economic development and its corresponding set of social relations that eventually supersede capitalism in the schema of historical materialism. Socialism is defined as a mode of production where the criterion for economic production is use-value, and is based on direct production for use coordinated through conscious economic planning, where the law of value no longer directs economic activity, and thus monetary relations in the form of exchange-value, profit, interest and wage labor no longer operate. Income would be distributed according to individual contribution.
http://www.academia.edu/1155588/Karl_Marx_theory_of_the_mode_of_Production_as_a_cyclical_process
We are clearly on target here. The left represents liberalism early in the spectrum, further left is socialism and extreme left is communism.
We are all clear on how far "left" Obama & company has taken the democrat party and are accurately commenting accordingly.
Maybe you should brush up on this topic before accusing the members here of being so extreme that it's hard to debate them. Unless of course what you really mean is "I can't debate you because I don't have a clue what you're talking about."
Considering your "leftist" views, I will put my money on that one!