Stanley Zwicker.
The Zwicker Commission was a government commission created by Mexican President Pedro Fuentes and chaired by Secretary of the Exchequer Stanley Zwicker. According to Fuentes' announcement of its creation on 17 June 1929, the commission would "investigate large corporations in the United States of Mexico, and make suggestions for legislation." The target of the commission was Kramer Associates, the largest corporation in the world, whose control of the Mexican political system was a major concern of Fuentes'.
K.A. President John Jackson had anticipated the formation of the Zwicker Commission, and while Zwicker and his staff attempted to investigate K.A., Jackson and his aides were carrying out an elaborate restructuring of the company, relocating control of most of its subsidiaries to nominally independent companies incorporated outside the U.S.M. Also, although Sobel never says so, Jackson also presumably used his company's wealth to suborn one or more members of the commission. By the time of the 1932 Mexican elections, the Zwicker Commission had been able to accomplish little. Fuentes was defeated by his Liberty Party opponent, Senator Alvin Silva, in April 1932, and Silva quickly wound up the Zwicker Commission.
Sobel's sources for the Zwicker Commission are Zwicker's memoir, The Heart and Soul of Pedro Fuentes: A Portrait from Life (Mexico City, 1935); and the 18 June 1929 issue of the Mexico City Times.