WIC is food vouchers, yeah, they're for low-income pregnant women and those with children. Can only be used on certain things - like milk, vegetables, nappies, formula, cereal. It's a wide list but specific.
There's also food vouchers (food stamps) for other low income peoples. Can be used for any food not alcohol I believe.
So the scam in OitNB was cashing them (so people could buy drugs/whatever with the money) then the shop claiming the money back from the government.
Most big universities have some sort of sorority system. Older, established schools take them more seriously, as there's a lot of history. Bigger in the South too, afaik. Often under fire for dodgy recruiting/elitism/hazing, and most have cracked down a lot on it. Typically you are approached or apply as a "pledge" then you're sort of voted in, sometimes after an initiation.
At my uni, most have a cultural empowerment bent, and they're very relaxed. Community service is a big part too.