Some biased hiring policies exist to this day, notable in Google and other big names. Certain demographics are given a 2nd chance interview if the first is bombed, among the more implicit biases. You won't find this written anywhere, of course. The big names don't want their illegal behavior to come out during discovery.
This research is also backed up by blind hiring experiments. Studies have shown that stripping name and gender from resumes results in less women and less minorities from being selected for interview (suggesting positive bias). Such blind hiring trials are quickly shuttered and swept under the rug to avoid rattling the PC orthodoxy.