Leadership refers to the behavior process of individuals or groups with certain powers and statuses, in order to achieve predetermined organizational goals, guide and influence others or organizations through their own roles, and complete predetermined tasks under certain conditions. Which of the following is not a leader? ['During the War of Resistance Against Japan, Mao Zedong and other older proletarian revolutionaries called on the people of the country to unite against Japan.', 'Scientists study biological systems, engineering automation technology, and communication network systems.', 'Leading members of the municipal party committee study and formulate policies and guidelines, and organize the mobilization of party members throughout the city to implement them.', 'After the organization department has been assessed, it is necessary to determine the candidates for each position and let them take up their posts.']