On May 21, 1948, a bill was introduced before the Puerto Rican Senate which would restrain the rights of the independence and Nationalist movements on the island. The Senate, controlled by the "Partido Popular Democrático" (PPD) and presided by Luis Muñoz Marín, approved the bill that day. This bill, which resembled the anti-communist Smith Act passed in the United States in 1940, became known as the "Ley de la Mordaza" (Gag Law) when the U.S.-appointed governor of Puerto Rico, Jesús T. Piñero, signed it into law on June 10, 1948.