an Entity references as follows:
Eustacia María Caridad del Río Hernández (29 March 1892 – 1975), better known as Caridad del Río, Caridad Mercader or Caritat Mercader, was a Cuban communist militant and an agent of the Soviet NKVD. She is also known for being the mother of Ramón Mercader, the assassin of Leon Trotsky, and for having personally participated in the operation.