Operation Zero Tolerance - 1997 X-Men Crossover (Marvel)

Operation: Zero Tolerance was a crossover storyline that ran through Marvel’s X-Men related titles during 1997. The story followed from the Onslaught Saga where Magneto's mind and Charles Xavier's subconscious’ merge and create the entity known as Onslaught. Most of the core non-mutant superhero teams (the Fantastic Four, a number of the Avengers and Bruce Banner), along with Doctor Doom sacrificed themselves in order to help destroy Onslaught.

This led to a great amount of distrust being harbored toward all mutantkind. Graydon Creed, a presidential candidate and outspoken proponent of mutant hatred, was assassinated by what was meant to look like an energy blast of some kind. This escalated humanity's festering feelings toward mutants.

The fallout of both of these events served as a springboard for the man known as Bastion to suggest to the government that in order to keep the nation safe from the growing mutant threat, they capture and exterminate all mutants. Bastion, along with the aid of his newly constructed Prime Sentinels, was given approval to implement this plan, which was dubbed "Operation: Zero Tolerance".

The main storyline was in the issues listed below, but I have included further issues that build upon and conclude the story.

Prelude:
Uncanny X-Men 343 (1997/04)
Generation X 25 (1997/03)
Uncanny X-Men 344 (1997/05)
Generation X 26 (1997/04)
Generation X 27 (1997/05)
X-Men 64 (1997/05)
X-Force 67 (1997/06)

Prologue:
X-Men 65 (1997/06)

Main Body:
Cable 45 (1997/08)
Generation X 29 (1997/08)
Uncanny X-Men 346 (1997/08)
Wolverine 115 (1997/08)
X-Force 68 (1997/08)
X-Men 66 (1997/08)
Cable 46 (1997/09)
Generation X 30 (1997/09)
Wolverine 116 (1997/09)
X-Force 69 (1997/09)
X-Men 67 (1997/09)
Cable 47 (1997/10)
Generation X 31 (1997/10)
Wolverine 117 (1997/10)
X-Men 68 (1997/10)

Conclusion:
X-Men 69 (1997/11)
Wolverine 118 (1997/11)

Aftermath:
X-Men 70 (1997/12)