Dak
mentat
You're right, abolition had been going on since the late 1700s - Ben Franklin wrote his own argument against slavery in 1790 or something like that. This seems to me, once again, as an example in favor of what I'm suggesting: that is, that anti-slavery arguments appeared well before slavery was finally made illegal.
Ben Franklin is the perfect example of the vanguard of the movement: Powerful and broadly accomplished (in this case maybe more so than his peers). Ben Franklin did and said a great many things, it would be more notable were he totally silent on the matter. Slavery was just part of the plethora of issues for him to consider and/or deal with. He gained or maintained no fame for this issue, it wasn't his primary concern, etc.
Contra social activists and academia decades and decades later, the rearguard. Their sole claim to fame, their sole source of income, etc. is in this one arena (or maybe a couple of related ones as well).
Alinsky is near worthless for most of the social critics I'm talking about. Foucault, Butler, Althusser... none of them mention Alinsky. That's because none of them wrote critiques of social relations that can be summarized as "TOTAL SOCIAL OPPRESSION NOW!!!" You should be more familiar with those critiques and what exactly it is they're critiquing if you want to characterize them so reductively. Butler's critique of gender in Gender Trouble has less to do with inequality (which, as you suggest, was already a hot-button topic) than it has to do with what gender means, how it functions.
You tend to have a very sharp reaction to these critiques as political firestarters, when that's not really what they are. They may have political consequences or concerns, but Butler isn't a political theorist.
Alinsky understood how to put theory into action. How to get people moving. He is a middleman to the ignorant man. Of course theorists aren't writing for his targets. They write for the Alinsky's or their peers.
I checked the SEoP:
http://plato.stanford.edu/entries/feminism-gender/
This view assumes that women and men, qua women and men, are bearers of various essential and accidental attributes where the former secure gendered persons' persistence through time as so gendered. But according to Butler this view is false: (i) there are no such essential properties, and (ii) gender is an illusion maintained by prevalent power structures.
Looks like "total social oppression now" to me. It's standard marxist/post-marxist shtick.
From my perspective, everything I'm presenting suggests otherwise. I either think you're blatantly wrong (about critiques of slavery, for instance, before the decline of slavery), or that you misinterpret what these more recent social critiques actually are.
You misunderstand me on the first thing, and I could be misinterpreting social critiques but if so I'm not some outlier.