Bill C16 in Canada (amendment to the Canadian Human Rights Act and the Criminal Code) is a good place to start. It's a recent, controversial issue that's generated a lot of material where you can see what's involved. Canada is ahead of us, not by much, though the First Amendment makes our defense from incursions to free speech more robust. Free speech is only one dimension of it though.

You can also look up post-modernism, neo-Marxism, intersectionality and related concepts. The moral and legal endpoint of the cultural revolution sought by these ideologies is essentially total rejection of liberal American values and structures deemed oppressive (nuclear family, "patriarchy", anything else you can name) for a perennially divided Orwellian society with morality dictated by mentally deranged social scientists that are actively anti-science, the think tanks organized around their work and brainwashed politicians. It's not an exaggeration of issues primarily confined to obscure academic sociology and philosophy journals and p.c. campuses anymore, the zit is getting ready to pop.