Why did the military dictatorships crack down on workers, students, and native peoples?

They were organized by the coffee barons.

They were part of the United Provinces of Central America.

They were loyal to the Spanish government.

They were subversive against the government.

They were subversive against the government.

Explanation:

Although the word subversive might be a bit strong. It's better to say that they were the opposition to the military dictatorship, because being subversive usually has the implication of arming oneself against the government, and neither the workers nor the students nor the native peoples were armed.

These are social groups that fought for democracy during the military dictatorship, and because of that, suffered from great oppression. Many leaders of student organizations, labor unions, and native communities were incarcerated, murdered, or disappeared.