No, for air traffic controllers themselves. There’s several lawsuits over it, it was…. Really poorly done.
For NASA I haven’t seen any evidence of any real discrimination and I’d be surprised to learn any different than your claim.
Discussion
To be clear, air traffic controllers were still properly qualified (they still had to go through the government ATC school), but the hiring practices to get there were incredibly racist. Sadly this also meant people who went to community colleges for ATC training got denied entry into the federal ATC school.