Fidel Castro is the classic example of a nationalist. Even though he's considered by some to be a left-wing nationalist, he sought to unify Cuba by eradicating everything that he considered a pollutant to his country and people. He adopted socialism as the only national political party. He took over control of all banks, industries, schools, hospitals, and doctors. He also controls the press and any international affairs. Since Castro came to power, Cuba's military prowess has considerably increased.
By controlling all aspects of the lives of his people, Castro hopes to keep them in check and in submission to his regime.