Critical Legal Theory vs. 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 on Critical Legal Theory and Critical Legal Studies.

I need to know:

1. Origin - (I think this is Marx, but I am having trouble getting details).
2. What triggered it - (political dissatisfaction with hierarchies? need more details)
3. Purpose - (to reconstruct government so no hierarchies exist?)
4. Main personalities
5. Its practice

Issues I am struggling with:

1. 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.

2. What does Karl Marx have to do with Critical Legal Theory? I cannot find much info on this except for this one fact.

3. 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, however I having issues picking apart the most vital information. 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 on the 5 elements above (origin, etc.), but not necessarily a long answer. 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 information, unless you have something on Marx that can assist me.)

Thank you in advance.