Vladimir Semichastny, chairman of the KGB, talking to Soviet intelligence officers Rudolf Abel (second from left) and Konon Molody (second from right) in September 1964
Iosif Romualdovich Grigulevich was a Soviet secret police (NKVD) operative active between 1937 and 1953, when he played a role in assassination plots against Communist and Bolshevik individuals who were not loyal to Joseph Stalin. This included the murders of claimed and actual Trotskyists during the Spanish Civil War including Andreu Nin Pérez, and an initial, failed assassination attempt against Leon Trotsky in Mexico.
Josip Broz Tito (left) with Grigulevich in 1953
The Yugoslav head of state, Marshal Tito (left), receives the Costa Rican ambassador, Teodoro B. Castro (right), on April 27, 1953. Ambassador Castro was in fact a Soviet illegal agent, Iosif Grigulevich, who, under orders from Stalin and the MGB, was plotting to assassinate Tito.