I don’t think an explicit blacklist exists, but I figure employers will google you, so they will know if you did anything that got you on the news or if you wro

I don’t think an explicit blacklist exists, but I figure employers will google you, so they will know if you did anything that got you on the news or if you wrote an article attacking your employer’s politics. If this search isn’t done by someone in the company, it’s probably done by a background check company they hire. Also, there is the concept of a back-channel reference, where someone from the hiring company will reach out to contacts at the candidate’s current and/or former employer and ask for opinions.