Depending on what you want to do... and since you mentioned working with releasing wrongly convicted criminals check with
The New England Innocence Project and see if they are looking for interns or volunteers.
another suggestion I would have, woudl require relocation on your part, but the
Southern Poverty Law Center, but generally their interns are second year law students, in fact, I'm sure you'll find that most internship positions will need for you to be in law school, and not just thinking about it.
What about spending a 5th year in college, to raise your GPA.
Also, how'd you do on your LSATs? they carry a lot of weight with the top tier law schools.
This site allows you to plug in your lsat score, and your gpa and gives you the schools you can get into...