In your written work, regurgitate the standard Marxist goals speaking generally and describe the society and all it's social programs as it goes into Marxism. Don't make final evaluations and close ambiguously.
At this point, turn the work in, and get back to your desk and write the final chapter. Here get specific, select a colonial nation that went communist (I prefer Rhodesia), analyze and report the changes in human rights and standard of living, and be brutal in your descriptions of communism's end game conditions on it's human victims. Add this chapter to your copy of your work.
At end of term, after grades are recorded, submit the final chapter to the Prof, and keep yours for your kids to read. You will be spending a lot of time reading with them, and when they hit the 7th grade give 'em this and read it with 'em. Here the kids' normal sympathy and empathy will drive the decision to Anything But Marxism, you will continue to guide them and prepare them for other political traps, but the Prof's intended use of sympathy will be defeated twice.
That's the way to deal with this type of professor.
While these are pressing matters and important, it is easy to lose track of the fact that your opinion does not matter to your professor. By virtue of the professor's position, having earned a degree on the subject, the professor does not see your views as being of equal merit. It does not matter if you are right - as far as a professor is concerned, these questions are settled in higher academic settings between people who already have their degrees, not students who are questioning their professors' methods. You're not likely to change his mind and you're also not likely to change the opinions of others in the classroom. I've learned this after long efforts of my own at being outspoken when my professors were clearly wrong.
Instead, I think Navy Patriot's approach is the best one to take. You can't change anything by speaking your conscience wen you're not perceived to be an equal authority but you can turn this against the system down the line. I like the idea of saving all your emotions and what you know is right for a parting shot. It makes your point all the more powerful when you do it that way.