Hermitage Museum private mansions were nationalized and redistributed among major Soviet state museums. Particularly notable was the influx of old masters from the Catherine Palace, the Alexander Palace, the Stroganov Palace and the Yusupov Palace as well as from other palaces of Saint Petersburg and suburbs. In 1922, an important collection of 19th-century European paintings was transferred to the Hermitage from the Academy of Arts. In turn, in 1927 about 500 important paintings were transferred to the Central Museum of old Western art in Moscow at the insistence of the Soviet authorities. In the early 1930s, 70 more paintings were sent there.
Soviet sale of Hermitage paintings were made in the same period, notably the Codex Siniaticus from the Russian National Library, sold in 1933 to the British Museum (after 1973 British Library) for £100,000 raised by public subscription (worth £ in 2019), and "The Night Café" by Vincent van Gogh. In the 1990s, following the collapse of the Soviet Union, the Parliament of the Russian Federation passed a new law prohibiting the sale of Russian art treasures to foreign countries. For many years the National Gallery was reluctant to lend the paintings it had bought from the Hermitage back to that Museum, for fear that the