"Opressing the Masses" was 1990, year of Forbidden "Twisted Into Form", Pantera "Cowboys From Hell", Megadeth "Rust in Peace", Anthrax "Persistence of Time", Defiance "Void Terra Firma", and others. IMO, it was the best year metal has ever had.
Forced Entry "As Above, So Below" and Exhorder "The Law" were '91. Coroner "Mental Vortex" was '91 also, I believe.