Translator, Political Activist, Syndicalist, Literary Agent. Born in Mexico City, she is best known for being the sister of the President of Mexico, Adolfo López Mateos. Esperanza's diverse career included work as a parliamentary stenographer and nurse, but her significant contributions emerged during her association with B. Traven. In 1939, she secured the film rights for two of Traven's novels and became his representative for Latin America. She played a pivotal role in translating Traven's works into Spanish, contributing to the spread of his literary influence, including "The Treasure of the Sierra Madre" (1946), "The Death Ship" (1950), and "The White Rose" (1951). Throughout World War II, Esperanza translated Traven's political articles. Esperanza's personal life intersected with political engagement, notably her relationship with Henry Schnautz, one of Trotsky's former guards. In 1948, she collaborated with Vicente Lombardo Toledano in founding the Partido Popular (later the Popular Socialist Party). Despite facing health challenges, including a spinal treatment after an alpine accident, Esperanza remained committed to her political and social causes. Her involvement in the 1950-1951 Nueva Rosita miners' strike showcased her dedication to workers' rights. Esperanza delivered funds and supported the miners, but the strike was eventually declared non-existent. Esperanza López Mateos died on September 19, 1951, under mysterious circumstances. While some suggest suicide due to post-accident conditions, suspicions of assassination lingered. Her legacy lives on, with various accounts, articles, a hospital named after her, and a novel, "Otra Máscara de Esperanza" by Adriana González Mateos, exploring her complex life and contributions.