How did Colombian drug cartels respond after the US and Colombian governments began working together to shut down the importation of drugs into the US?

When Colombia and the United States cooperated to disrupt drug shipments, major cartels—especially the Medellín Cartel—responded with a campaign of violence to pressure the Colombian government. They assassinated and attacked government officials, judges, police officers, and others. This makes D, “They began a campaign of violence, murdering hundreds of government officials,” the best answer.

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