So, the Anti-Corn Law League destroyed grain tariffs in Britain and permanently altered the public perception of tariffs in that country compared to the rest of the world (more of the British public correctly see tariffs as a way to screw over customers than as a way to protect domestic jobs).

Abolition groups also seem like they should be mentioned, here.

Those are just the two off the top of my head, but I'm not sure they fit "this kind" of approach. The first one suggests a "do the math" approach to helping people, but also a strong deontologist "this isn't fair!", and the second one seems mostly along the same lines. I don't think SIAI and such are that comparable to Garrison, but perhaps they are.

I guess my questions in response are "can you be more specific by "this kind of approach" and "what are your standards for a 'major' problem?"