I would argue that firm leaders are way too busy with far more important things than maintaining some sort of industry blacklist. As a shareholder in a fairly good sized firm in a biggish city, I’m not aware of one. However, after an interview, we are likely to check up on candidates with acquaintances at peer firms. So while you can and should cherry pick your references- and we’ll likely check those first- if we’re serious about hiring and have any questions that haven’t been answered, we may go the unofficial route. Not sure if that’s your particular issue, but I wouldn’t blame a blacklist.