Three theaters and three cinemas were opened in the city in 1931. The Primorye Picture Gallery's collection was assembled from 1929 to 1931. About 1,000 pictures were brought there from the Hermitage, the Russian Museum and the Tretyakovskaya Gallery. Many ethnic groups considered rebellious by Stalin's eyes, including Chinese, Manchu, Jews, Ukrainians, Poles, Crimean Tatars, Chechens, and Armenians, were transported. During the 1930s mass repression began in the country, and a transit camp for political prisoners sent from western Russia to Kolyma was opened in Vladivostok. The prisoners arrived by train and left on prison ships in terrible conditions. Soviets at first, after 1939 the prisoners came from Eastern Europe and were Japanese POWs after World War II. Factories, ports and cities in the Far East were built by prison labor during the 1930s. After American pilots bombed Tokyo on April 18, 1942, one of the sixteen B-25 bombers landed in Vladivostok when it ran out of fuel; the bomber was confiscated and its crew interned. Although Captain Edward York and his crewmates were well-treated, diplomatic efforts to return them to the United States failed. They were eventually moved to Ashgabat ( from the Iranian border); York bribed a smuggler to help them cross the border and reach a nearby British consulate on 11 May 1943. According to declassified Soviet archives, the smuggling was staged by the NKVD because the Soviet government felt it could not repatriate them legally due to its neutrality pact with Japan. In 1954 First Secretary of the Communist Party Nikita Khrushchev visited Vladivostok, the first Russian leader to do so. After Khrushchev's visit, urban development began. In 1956 the Far Eastern State University, the only classical university in the Russian Far East, was reopened. The microdistrict of Churkin was built during the late 1950s, and Vtoraya Rechka (Second River) and Morgorodok were developed during the early 1960s. Vladivostok's last large district built with new, multistory houses is at Patrisa Lumumby and Neybuta Streets, begun in 1980. From the 1950s to the 1980s the fishing industry was developed. For many years the ports of Vladivostok ranked first in freight turnover in the Russian Far East, recently yielding to Nakhodka. The city also produced a large volume of military goods. From 1930 to the 1970s, foreigners were not allowed to visit Vladivostok, but in 1974 the Vladivostok Summit Meeting on Arms Control was held with General Secretary of the Central Committee of the Communist Party of the Soviet Union (CPSU) Leonid Brezhnev and US President Gerald Ford.