ProZ.com offers a service to industry partners where the ProZ.com team finds and screens language professionals, manages projects, and also makes sure they get paid (using ProZ*Pay). The team in charge, the Outsourcer Assistance Team (OAT), performs this service in order to channel more work to paying ProZ.com members.
You can see the most active interpreters and translators from this last month here: https://go.proz.com/leaderboard-oat