CUBAN EMIGRATION EXPLAINED
"When compared with most migratory waves until that time, Cuba's post-revolutionary emigration was a historic anomaly. The emigrants represented the most privileged sectors of the previous regime and their decision to emigrate reflected a clear political choice against the Cuban revolution. Under this premise, the United States accepted them under exceptional conditions and the emigres became the social base for the counter-revolution.
Beginning in 1980, those presuppositions were radically altered and a crisis afflicted the bases that had created both the United States' preferential policy and the Cuban government's overall opposition to the emigration movement. "
(Progresso)