I disagree. PBS and NPR have deep political biases in their programming. Either remove the biases, or scrap the programs. I don't need entities telling me how to think, I will review facts and come to my own conclusions.
As for private companies that get public funding...that's a bit vague, so I can't comment on that.
If you think they don't have deep political biases, you need to step out of your echo chamber and breathe some fresh air.