exlurker is right on the dates of BU's GLOs.
Collin has the "exile" info correct.
<broken record> Stay on good terms w/ independents. You never know when one of them will be in a position to make or break your legacy. This is what happened at BU - some very early IFC and NPC history got clipped by someone (several, actually) either hostile to or indifferent to Greek life. </broken record>
--add