The leftover hash lemma is a lemma in cryptography first stated by Russell Impagliazzo, Leonid Levin, and Michael Luby.
Levin Gale (April 24, 1784 – December 18, 1834) was an American politician.
 Born in Elkton, Maryland, Gale attended the common schools, studied law, and was admitted to the bar and practiced in Elkton.
 He was member of the Maryland State Senate in 1816, and was elected from the sixth district of Maryland as a Jacksonian candidate to the Twentieth Congress, and served from March 4, 1827, to March 3, 1829.
 He declined to be a candidate for renomination in 1828, and resumed the practice of law.
 He died in Elkton.
The PPSh-41 ("pistolet-pulemyot Shpagina"; Russian: Пистолет-пулемёт Шпагина ; "Shpagin machine pistol"); is a Soviet submachine gun designed by Georgy Shpagin as a cheap, reliable, and simplified alternative to the PPD-40.
 Common nicknames are ""pe-pe-sha"" (Russian: ППШ ) from its three-letter prefix and ""papasha"" (Russian: папаша ), meaning "daddy".
Leonid Anatolievich Levin ( ; Russian: Леони́д Анато́льевич Ле́вин ; Ukrainian: Леоні́д Анато́лійович Ле́він ; born November 2, 1948) is a Soviet-American computer scientist.
Cossacks (Russian: Казаки ) is a sculpture composition on the north-west outskirts of Volgodonsk, Rostov oblast, Russia.
 It decorates the lock № 15 of Volga–Don Shipping Canal.
 The sculpture composition was opened in 1953.
 It was designed by sculptor Georgy Motovilov and architect Leonid Polyakov.
 Resolution of the Council of Ministers of the Russian Soviet Federative Socialist Republic of August 30, 1960 № 1327 the monument was designated a federal Heritage Site.
 It is the only object of federal cultural heritage in Volgodonsk and Volgodonskoy District.
 "Cossacks" sculptures symbolize military glory of the Don Cossacks as a whole and feat of the 4th Guards Kuban Cossack Cavalry Corps during the Great Patriotic War.
Pseudogapping is an ellipsis mechanism that elides most but not all of a non-finite verb phrase; at least one part of the verb phrase remains, which is called the "remnant".
 Pseudogapping occurs in comparative and contrastive contexts, so it appears often after subordinators and coordinators such as "if", "although", "but", "than", etc.
 It is similar to verb phrase ellipsis (VP-ellipsis) insofar as the ellipsis is introduced by an auxiliary verb, and many grammarians take it to be a particular type of VP-ellipsis.
 The distribution of pseudogapping is more restricted than that of VP-ellipsis, however, and in this regard, it has some traits in common with gapping.
 But unlike gapping (but like VP-ellipsis), pseudogapping occurs in English but not in closely related languages.
 The analysis of pseudogapping can vary greatly depending in part on whether the analysis is based in a phrase structure grammar or a dependency grammar.
 Pseudogapping was first identified, named, and explored by Stump (1977) and has since been studied in detail by Levin (1986) among others, and now enjoys a firm position in the canon of acknowledged ellipsis mechanisms of English.
Georgy Maximovich Adelson-Velsky (Russian: Гео́ргий Макси́мович Адельсо́н-Ве́льский ; name is sometimes transliterated as Georgii Adelson-Velskii) (8 January 1922 – 26 April 2014) was a Soviet and Israeli mathematician and computer scientist.
Operation Y and Shurik's Other Adventures (Russian: Операция „Ы“ и другие приключения Шурика ) - (Operatsiya „Y“ i drugie priklyucheniya Shurika) is a 1965 Soviet slapstick comedy film directed by Leonid Gaidai, starring Aleksandr Demyanenko, Natalya Seleznyova, Yuri Nikulin, Georgy Vitsin and Yevgeny Morgunov.
 The film consists of three independent parts: "Workmate" (Напарник, "Naparnik"), "Déjà vu" (Наваждение, "Navazhdeniye") and "Operation Y" (Операция „Ы“).
 The plot follows the adventures of Shurik (alternative spelling — "Shourick"), the naive and nerdy Soviet student who often gets into ludicrous situations but always finds a way out very neatly.
Transport in the Union of Soviet Socialist Republics (USSR) was an important part of the nation's economy.
 The economic centralisation of the late 1920s and 1930s led to the development of infrastructure at a massive scale and rapid pace.
 Before the Soviet Union's collapse in 1991, there were a wide variety of modes of transport by land, water and air.
 However, because of government policies before, during and after the Era of Stagnation, investments in transport were low.
 By the late 1970s and early 1980s Soviet economists were calling for the construction of more roads to alleviate some of the strain from the railways and to improve the state budget.
 The Civil aviation industry, represented by Aeroflot, was the largest in the world, but inefficiencies plagued it until the USSR's collapse.
 The road network remained underdeveloped, and dirt roads were common outside major cities.
 At the same time, the attendance of the few roads they had were ill-equipped to handle this growing problem.
 By the late-1980s, after the death of Leonid Brezhnev, his successors tried, without success, to solve these problems.
 At the same time, the automobile industry was growing at a faster rate than the construction of new roads.
 By the mid-1970s, only 0.8 percent of the Soviet population owned a car.
Leonid "Lyonya" Golubkov (Russian: Лёня Голубков ) is a "common Russian guy" played by Vladimir Permyakov in notorious MMM commercials from 1992 to 1994.
 Due to a very aggressive advertising campaign by MMM owned by Sergei Mavrodi, most people know Vladimir Permyakov by this name.

Question: What do Georgy Adelson-Velsky and Leonid Levin have in common?
Answer: computer scientist