Treatment Action Group (TAG) is a U.S.-based organization that has been prominent within the movement of HIV/AIDS activism. Being formed in 1991, it has possessed the goals of working with worldwide efforts to increase research on treatments for HIV and for deadly co-infections that affect individuals with HIV, such as hepatitis C and tuberculosis, as well as spur on greater access to and efficient usage of already available treatments. The group additionally monitors research on a possible HIV vaccine and on fundamental science aimed at understanding the pathogenesis of HIV/AIDS.