Old school. If you needed another team member HR and the Boss would hire one. And you'd have to work with them. If the company thought they weren't hiring enough women and blacks they'd just hire some women and blacks.

New way, we only hire from the top schools and programs. And we allow members of the team to act as gate keepers over vague things like 'cultural fit'. Over time your team becomes composed entirely of upper class whites and a few model minorities.