Reza Pahlavi, son of the late Shah of Iran, speaks to nearly 12,000 Iranian expatriates during a rally in Los Angeles Sunday. Pahlavi delivered his talk in Farsi, and the flag of the Shah's regime stood at his right. The rally was held in Los Angeles because that city has the largest Iranian pouplation, about 500,000, outside Iran. The Shah's regime was toppled 10 years ago.