Looking at the GLOs that have pages on Wikipedia...
If listed Alphabetically by the Actual Greek Letters (So the three letter groups would go ΑΑΑ, ΑΑΒ, ΑΑΓ...ΩΩΩ)
- The first group is Alpha Beta Alpha, which is a Library science honorary/professional co-ed fraternity that had as many as 30 chapters at one time and has one active chapter left.
- The last group is Omega Psi Phi, a historically African American Fraternity and member of the NPHC.
If listed Alphabetically by the English spelling (So the three letter groups would go Alpha Alpha Alpha, Alpha Alpha Beta, Alpha Alpha Chi,... Zeta Zeta Zeta)
- The first group is still Alpha Beta Alpha
- The last group is Zeta Tau Alpha, a sorority and member of the NPC