Question: When was Sergei Korolev arrested?
About the article "Space Race", section "Rocket teams assembled".

Candidate passages:
On 22 June 1938, during the Great Purge, Korolev was arrested by the NKVD after being denounced by Ivan Kleymenov, Georgy Langemak, and Valentin Glushko.
He was accused of deliberately slowing the work of the research institute, and following torture in the Lubyanka prison to extract a confession, was tried and sentenced to ten years in a Gulag work camp.
Korolev later learned that he had been denounced by Glushko, and this may have been the cause of the lifelong animosity between the two men.
Glushko and Korolev had reportedly been denounced by Andrei Kostikov, who became the head of RNII after its leadership was arrested (Kostikov was ousted a few years later over accusations of budget irregularities).
Believing that his arrest was a mistake, Korolev wrote many appeals to the authorities, including Stalin himself.
Following the fall of the NKVD head, Nikolai Yezhov, the new chief Lavrenti Beria chose to retry Korolev on reduced charges in 1939, but by that time Korolev was on his way from prison to a gulag camp in the far east of Siberia, where he spent several months in a gold mine in the Kolyma area before word reached him of his retrial.
In the work camp, conditions were extremely rough – inadequate food, shelter, clothing, work assignments, and thousands of prisoners dying each month.
Towards the end of 1939 he was sent back to Moscow, but he had already sustained injuries and had lost most of his teeth due to the labor camp's brutal conditions.
When he reached Moscow, Korolev's sentence was reduced to eight years, which he did not have to serve in a labor camp.
He rarely talked about his experience in the Gulag.
Other members of the RNII had also been arrested.
Kleymenov and Langemak were executed, leaving Korolev very fortunate to have even survived.
The rocket program was set back for years and fell far behind the rapid progress taking place in Germany.
Korolev was assigned to a "sharashka", a penitentiary for intellectuals and the educated.
These were effectively slave-labor camps where scientists and engineers worked on projects assigned by the Communist party leadership.
The "Central Design Bureau 29" (CKB-29, ЦКБ-29) of the NKVD, served as Tupolev's engineering facility, and Korolev was brought here to work for his old mentor.
During World War II, this sharashka designed both the Tupolev Tu-2 bomber and the Petlyakov Pe-2 dive bomber.
The group was moved several times during the war, the first time to avoid capture by advancing German forces.
In 1942 Korolev managed to be moved to the "sharashka" of Kazan under Valentin Glushko, which designed rocket-assisted take off boosters for aircraft.
Korolev was kept in the sharashka and isolated from his family until 1944.
He lived under constant fear of being executed for the military secrets he possessed, and was deeply affected by his time in the camp, becoming reserved and cautious.
On 27 June 1944, Korolev – along with Tupolev, Glushko and others – was finally discharged by special government decree, although the charges against him were not dropped until 1957.
The design bureau was handed over from NKVD control to the government's aviation industry commission.
Korolev continued working with the bureau for another year, serving as deputy designer under Glushko and studying various rocket designs.
In 1944, Korolev and Glushko designed the RD-1 KhZ auxiliary rocket motor tested in an unsuccessful fast-climb Lavochkin La-7R. 
The Korolyov RP-318 or RP318-1 was Russia's first rocket-powered aircraft, built in 1936.
Built in 1936 by Sergei Korolev as an adaptation of his SK-9 glider, it was originally to have been used to flight test an early rocket engine designed by Glushko.
When both Korolev and Glushko were arrested and sent to the Gulag in 1938, development of the RP-318 was continued by others, culminating in the first powered flight on Feb. 28, 1940.
Test pilot V. P. Fedorov was towed to 2,600 m and cast off at 80 km/h before firing the rocket engine and accelerating the aircraft to 140 m/s andan altitude of 2,900 m. In all, the RP-318 flew nine times before World War II ended the work.  
The Akademik Sergei Korolev () was a space control-monitoring ship constructed in 1970 to support the Soviet space program.
Named after Sergei Korolev, the head Soviet rocket engineer and designer during the Space Race between the United States and the Soviet Union in the 1950s and 1960s, the ship also conducted upper atmosphere and outer space research.
In Soviet times, the "Akademik Sergei Korolev" was a large communications ship which was part of a fleet of communications ships.
These ships greatly extended the tracking range when the orbits of cosmonauts and unmanned missions were not within range of Soviet land-based tracking stations.
The ship mainly operated in the Atlantic Ocean monitoring spacecraft trajectory, telemetry data, and guaranteed a communications link with the cosmonauts.
The ship had about 1200 accommodations, including 79 laboratories, in which 188 scientific workers performed their duties.
In 1975, the ship was a part of the Soviet-American Apollo-Soyuz joint test program. 
Sergei Alexandrovich Korolev (1874-1932) was a Russian microbiologist and professor and the founder of industrial microbiology.
He was one of the founders of the Soviet dairy industry at the beginning of the 20th century.
Through the work of Korolev, his colleagues and students, the microbiology of milk and dairy products was developed considerably. 
212 was a kind of soviet cruise missile developed in 1936 by Sergei Korolev.
It was tested twice before being cancelled in 1939.
The design was completed in August 2, 1936, and consisted of a rocket with wings which launched from a catapult.
The catapult was tested twice in November, 1936, using a mock-up of the missile; both tests failed.
It was then decided to use a Tupolev TB-3 aircraft as launch platform.
The first test was done in May 27, 1938.
Korolev was arrested one month later, but the project continued without him.
In January 10, 1938 it was decided to no longer use Valentin Glushko's ORM-65 rocket engine due to problems with the control system and some explosions.
At that time the name of the missile was changed to "803".
During 1939 there were two more tests, failing again due to the control system.
The project was finally abandoned.