I once worked for a company where our tech chief made various hacks to FreeBSD to allow it to have very large number of groups and users could belong to a lot o

I once worked for a company where our tech chief made various hacks to FreeBSD to allow it to have very large number of groups and users could belong to a lot of groups. This allowed each project to have a gid, so that people working on a particular project could belong to that group and the file permissions can be set accordingly. The company would have hundreds of projects per year, and this was used for many years. This was fine until Linux and NetApp technologies were being introduced, it did not play very well with the hacks to groups.