TAIPEI, Taiwan—Four retired Taiwanese intelligence officials were indicted on Feb. 20 for allegedly spying for China, according to local prosecutors. The four worked for the Military Intelligence Bureau, an agency under Taiwan’s Ministry of National Defense. According to local media, they were accused of violating the island’s National Security Act and the National Intelligence Service Law for passing on confidential intelligence to Chinese agents and developing a spy network since 2013. The four once held high-ranking military positions in the bureau. Yueh Chih-chung was a former major general while the other three were former colonels: Chang Chao-jan, Chou Tien-tzu, and Wang Ta-wang. In exchange for information about Taiwan, Chinese intelligence officials offered Chang, Chou, and Yueh cash, free trips to China, and business opportunities in China, prosecutors alleged. China claims Taiwan as a part of its territory and seeks to unite the self-ruled island with the mainland, through peaceful or …