No, I pointedly didn't confuse those two. The Software Freedom Conservancy owns the copyright on Busybox, and vigorously enforces it. They'll also happily enforce the copyrights of anyone else willing to work with them, which sadly includes relatively few people and projects.

The Software Freedom Law Center provides legal services, which could include GPL enforcement if desired, but they don't actively seek to do GPL enforcement on behalf of any particular project unless that project asks them to do so.