Students staged a walkout of the intro economics class at Harvard, as a protest against the bias they perceive in the course (here is their open letter). Every other year, Harvard Professor Stephen Marglin teaches Economics: A Critical Approach (syllabus here), as an alternative intro course for Harvard freshmen. The video below shows Marglin at a teach-in, given to students at Occupy Harvard on December 7, 2011.
In his blog today, Greg Mankiw disagrees with the approach taken by Marglin: "A main disagreement I have with Steve is pedagogical. I believe his critiques of mainstream economics should be presented after students have had a standard course like ec 10. That is, I would suggest Steve aim his course at sophomores rather than freshmen."