There are many organizations who work on multitude marijuana issues such as advocacy, marijuana prisoners, federal marijuana rescheduling, marijuana lagalization and many more. Here are links to some of the largest and most influential:
Norml
NORML’s mission is to move public opinion sufficiently to legalize the responsible use of marijuana by adults, and to serve as an advocate for consumers to assure they have access to high quality marijuana that is safe, convenient and affordable
Americans for Safe Access
The mission of Americans for Safe Access (ASA) is to ensure safe and legal access to cannabis (marijuana) for therapeutic uses and research. ASA works with our grassroots base of over 100,000 members to effect change using public education and direct advocacy at the local, state, and federal level.
Marijuana Policy Project
Because MPP believes that the greatest harm associated with marijuana is prison, we focus on removing criminal penalties for marijuana use by changing policies and laws, with a particular emphasis on making marijuana medically available to seriously ill people who have the approval of their doctors.
Marijuana Majority
https://www.marijuanamajority.com/
Marijuana Majority exists to help more people understand the simple fact that supporting commonsense solutions like regulating marijuana sales and ending marijuana arrests are mainstream positions and that there’s no reason those who support reform should be afraid to say so. We provide resources that make it easy for individual supporters to take part in actively building the Marijuana Majority by contacting celebrities, elected officials and opinion leaders to encourage them to add their voices to the debate.
Drug Policy Alliance
The Drug Policy Alliance (DPA) is the nation’s leading organization promoting drug policies that are grounded in science, compassion, health and human rights.