Cannabis Cheri has been a big supporter of Safer Shirts for a while now.
She also works with NORML, The Human Solution and many other organizations.
She does amazing work organizing and attending protests/rallies/court support/etc.
She works with prisoners who have been arrested for marijuana and raises awareness regarding these folks their situation, their court dates, how to donate to their books while they are in jail, etc.
UPDATE: Cheri asked me to include a link to an online petition to release marijuana prisoners. Here it is.
She also makes great tie dye shirts! She has tons of amazing recipes for cannabis infused foods!
Here are some photos and some links to help you get better acquainted with this fantastic activist.