MWF has been involved in Montana's legislature since 1936. Every session, they are the only full-time lobby presence for hunters during the session.
Montana Trout Unlimited is the same but for cold water conservation.
MTBHA does amazing grassroots work, and has some of the most dedicated young conservationists I've met yet.
RMEF is a powerhouse when it comes to habitat conservation, increased access & better conservation outcomes at the federal level.
TRCP does fantastic work at the state level in a ton of issues around public lands, migration corridors, refuges, etc.
Montana Bowhunters Association is the lodestar for archery groups & maintaining ethical archery pursuits.
Tons of local rod & gun clubs across the state, like RCFWA, Anaconda Sportsmen, Helena Hunters & Anglers, etc who all work their tails off to provide better wildlife & wildlife habitat while defending our birthright at the commission, legislature & congress.
MT is an advocates dream. So.many.good organizations to choose from.