 Her early years in politics were marked ideologically by Christian socialism, though later on she was heavily influenced by Marxism.In 1970, after finishing her studies at UES, Lil decided to leave her home in San Jacinto, where she lived with her parents, and began her life in clandestinity.In 1971, she appears as part of a small movement called simply "El Grupo," which formed the core of the organization that in March 1972 would become the People's Revolutionary Army (ERP), in the midst of a turbulent electoral process.