Mohandas Gandhi is a figure representative of an independence movement, which can perhaps be connected to nationalism. He worked to make India independent of England in the 20th century, using methods of non-violence resistance.
I've always thought Adolph Hitler was the benchmark of nationalism. Seeing pictures of the Hitler youth, to the marches, rallies, and even the way he used the Olympics to engender a sense of national pride always haunts me to a degree. National symbols and propaganda were also a big part of his establishment of nationalism.
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.
The leaders of North Korea (Kim Il Sung, Kim Jong Il, and now Kim Jong Un) have all used nationalism as a way of keeping their country together. They claim a long and unbroken history for the Korean people and they argue that they are the only leaders capable of standing up for the Korean nation.
In reply to 6:
Mohandas Gandhi worked for independent Hindu dominated India whereas Jinah worked for a separate independent state for Muslims - Both aimed for independence from British Empire but with different objectives. Jinah struggle was for a separate state for Muslims because of extreme cultural and religious differences from Hidus. One of many differences is that for Hindus a cow is as sacred as mother but for Muslims it is a delicious food item and they slaughter it'.
In today's India, Muslims are being killed and there mosques erazed which is the proof of there grudge against Muslims. The killing in Jammu & Kashmir has reached the extreme but the world community is not taking any note of it and is denying them the right of plebiscite in spite of UN resolution.
Najm - Pakistan (born in British ruled India)
Mohammad Ali Jinah was a Muslim nationalist leader who presented the Two Nation Theory in the Hindu dominated British India. He succeded in creating the Islamic Republic of Pakistan by convincing the British Raj to divide India in to two countries based on religion. The country was created by holding referendum. Pakistan is the only state which has been created by the sons of the soil in the name of religion with a slogan "Pakistan ka matlab kia: La ilaha illallah" i.e. "Pakistan just means: There is no god but Allah" making Quran as the Supreme Constitution of Pakistan.
Israel may be termed to be the other religion based state but it was created against the will of the people of the land by force.