Law 53 of 1948 better known as the Gag Law, was an act enacted by the Puerto Rico legislature of 1948, with the purpose of suppressing the independence movement in Puerto Rico. The act made it a crime to own or display a Puerto Rican flag, to sing a patriotic tune, to speak or write of independence, or to meet with anyone or hold any assembly in favor of Puerto Rican independence. It was passed by a legislature that was overwhelmingly dominated by members of the Popular Democratic Party (PPD), which supported developing an alternative political status for the island. The bill was signed into law on June 10, 1948 by Jesús T. Piñero, the United States-appointed governor. Opponents tried but failed to have the law declared unconstitutional by the United States Supreme Court.

The flag of Puerto Rico represents Puerto Rico and its people. It consists of five equal horizontal stripes, alternating from red to white, with a blue equilateral triangle based on the hoist side bearing a large, sharp, upright, five-pointed white star in the center. The white star stands for the island, the three sides of the triangle for the three branches of the government, the blue for the sky and coastal waters, the red for the blood shed by warriors, and the white for liberty, victory, and peace. The flag is popularly known as the Monoestrellada (Monostarred), meaning having one star, a single star, or a lone star. It is in the Stars and Stripes flag family.