Sigma Chi fraternity Organization ends convention in Denver. RMN Je 20, 1965 p.40 Rules on racial discrimination altered at Colorado University. Post Je 24, 1965 p.22 Sigma Chi will defy Colorado University by participating in rush week. Post S 8, 1965 p.46 Fraternity cuts ties with Colorado University. Post 19, 1966 p.42 Sigma Chi files suit against Colorado University for violating constitutional rights of members. RMN Je 28, 1966 p.12A