The group of Cubans is an interesting mix of Fidel Castro and his followers versus the Cuban exiles trying to displace them.  The CIA and other organizations were supporting the exiles and led them to run ahead of the support available... and why the Bay of Pigs invasion failed spectacularly.  Cuban intelligence had an active presence during this time period, keeping tabs on exiles as they planned a counter revolutionary return and eliminating some of the threats and potential threats.
Quotes