Glass Curtain an anti-Western terrorist organization headed by anarchist Errol Sparks.
It is during a cold mission against Glass Curtain that Michael and his wife Simone are ambushed and encounter resistance. In the ensuing fire fight, Simone is presumably killed.
Three years later Nikita discovers a tortured Simone in Glass Curtain's underground compound. Freed by Section One, Simone chooses revenge and locks herself in a sealed bunker despite Michael's pleas. She activates the self-destruct mechanism and Simone and Sparks perish in the explosion.
Two years later, a resurrected Glass Curtain resurfaces with Errol Sparks at the helm, having clearly survived the explosion Simone set up.
Remnants of Glass Curtain would later join The Collective.