Critical Legal Theory and Critical Legal Studies

I was assigned a 7 minute oral report yesterday.  I am having trouble distinguishing these two topics from one another.  I plan to encompass both in my presentation.

I need to know:
Origin - I think this is Marx, but I am having trouble getting details
What triggered it - political dissatisfaction with heirarchies? need more details
Purpose - to reconstructure gov't so no heirarchies exist?  
Main personalities
Its practice



What is the difference between the Critical Legal Theory and Critical legal Studies?  From what I currently understand, Critical legal theory was initiated by Marx...is critical legal studies the study of critical legal theory??  I need clarification.
What does Karl Marx have to do with Critical Legal Theory?  I cannot find much info on this except for this one fact.  Mark Tushnet? Other important influences??  I need specifics so I can compose this essay/oral report.  I know enough right now for about 4 min of speaking, so I need more details.  I have the Altman book and the Adams book with Tushnet...I am having issues picking apart the most vital info...I cannot go over 7 minutes, but I wish to cover everything.  I guess I just need details on the general stuff.



I need a VERY detailed answer, but not neccessarily a long answer.  Credits offered reflect this.  Please do not cut and paste from internet searches, unless you supplement it with a good deal of your own insight (I have already checked out the majority of online info...unless you have something on Marx that can assist me.)  Thank you in advance.