Paoli's political activities and beliefs influenced his literary work. 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
archipelago. The Senate, which at the time was controlled by the
Partido Popular Democrático (
PPD) and presided by
Luis Muñoz Marín, approved the bill. 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, technically "Law 53 of 1948") when the U.S.-appointed governor of Puerto Rico,
Jesús T. Piñero, signed it into law on June 10, 1948. Under this new law it became a crime to print, publish, sell, or exhibit any material intended to paralyze or destroy the
insular government; or to organize any society, group or assembly of people with a similar destructive intent. It made it illegal to sing a patriotic song, and reinforced the 1898 law that had made it illegal to display the
Flag of Puerto Rico, with anyone found guilty of disobeying the law in any way being subject to a sentence of up to ten years imprisonment, a fine of up to US$10,000 (), or both, for each offence. According to Dr.
Leopoldo Figueroa, a non-PPD member of the Puerto Rico House of Representatives, the law was repressive and was in violation of the First Amendment of the
US Constitution which guarantees
Freedom of Speech. He pointed out that the law as such was a violation of the civil rights of the people of Puerto Rico. In 1949, the Nationalist Party held an assembly in the town of
Arecibo and named Paoli Secretary General of the party. Some of his duties as Secretary General of the party included the presentation of patriotic speeches. Due to the Gag Law, these duties placed Paoli on a collision course with the U.S. government. In September 1950, Paoli traveled to the towns of
Cabo Rojo,
Santurce,
Guánica and
Lares, where he participated in Nationalist activities. On October 30, the Nationalists staged uprisings in the towns of
Ponce,
Mayagüez,
Naranjito,
Arecibo,
Utuado (
Utuado Uprising), San Juan (
San Juan Nationalist revolt), and
Jayuya (
Jayuya Uprising). On November 2, 1950, the police arrived at Paoli's home in
Río Piedras and searched for guns and explosives. The only thing they found was a Puerto Rican flag but, due to the Gag Law, this enabled them to arrest and accuse Paoli of treason against the United States. The evidence used against him was the Puerto Rican flag in his home, and four speeches he'd made in favor of Puerto Rican independence. On the basis of this "evidence" Paoli was fired from his professorship at the University of Puerto Rico, and sentenced to a twenty-year prison term, which was later reduced to ten years. In jail, he shared his cell with Pedro Albizu Campos. Campos suffered from ulcerations on his legs and body caused by radiation, and Paoli tended to his needs. ==Political prisoner==