robert bazell with march on a group that's taking the struggle to the streets and beyond that. >> reporter: today demonstration by the militant group, act up. it has increasing influence on aids policies. the weekly meetings attract hundreds. and it counts 10,000 members nationwide. mostly young, mostly gay. >> let's do a big demonstration there and keep it there. >> reporter: the atmosphere at the meetings and group's headquarters characterized by enthusiasm and belligerance toward established institutions. playwright larry kramer started act up to accelerate the aids drug approval process. >> what right doesรง the fda an nih have the right to tell a dying person what to do with his or her body. >> reporter: act up's tactics often offend.