But really, you can trace it back further than the 60’s, as far back as in the 1920’s with C Wright Mills. He was a sociologist who essentially argued that science shouldn’t pursue explanatory knowledge, but rather emancipatory knowledge. The idea was that science can’t be some external objective thing apart from human political systems.
As for why it didn’t enter the national awareness until the last decade, I have no idea. But I think it has to do with the internet, that’s my intuition.