What other rebel groups were there besides the June 14 movement that the Americans assisted?

The revolutionary impulse had already existed prior to June 14, 1959, when armed revolutionaries from outside the country were repelled by the regime, but this conflict is what gave the Mirabal sisters’ movement its name. Almost exactly ten years earlier, on June 19, 1949, exiled Dominicans had tried to overthrow Trujillo’s dictatorship by landing on Luperón bay by Puerto Plata, but they had failed. In 1959, another attempt to topple the regime was launched from Cuba. (Internet sources are rather unreliable, sometimes conflating the 1949 and 1959 events, and sometimes conflating the 1959 invaders with the later Fourteenth of June domestic revolutionary group.) You can check out more about this at the GradeSaver link below: