At Western, GLO's are not recognized by the school so whatever groups have become inactive must have closed for their own reasons:
Sororities: none inactive! yay!
Fraternities:
ACACIA - Western Ontario (1985-2000)
Delta Tau Delta - Theta Alpha (1987-2001)[ I don't know if they ever actually closed at any pt b/c they're still active now]
Zeta Beta Tau - Zeta Eta (1991-1994)
Sigma Alpha Epsilon - Ontario Alpha, 1990-2003[last I checked they were around too but maybe they aren't open in 2004?]
Sigma Pi - Zeta Iota (1985-2000)
*all info from canadiangreeks.com