by . During these years, many new animators joined the studio's puppet division: and ( (1965)), ( (1966), (1967), (1967)), Nikolay Serebryakov ( (1966), Happiness Is Not in the Hat (1968), (1968)). In the 1960s, the production of satirical cartoons increased. Animation began to raise acute social and philosophical topics. Especially famous were (1961) by the Brumberg sisters, (1966) by Fyodor Khitruk, Passion of Spies (1967) by Yefim Gamburg, There Lived Kozyavin (1966), and, banned by Soviet censorship, (1968) by Andrei Khrzhanovsky. The most famous works of the Soyuzmultfilm of the 1960s: Cipollino (1961) by Boris Dyozhkin, Shareholders (1963) by Roman Davydov, by (1963), (1964), by Alexandra Snezhko-Blotskaya (1963), (1963) and Rikki-Tikki-Tavi (1965), (1964) by Mikhail and Vera Tsekhanovsky, Lefty (1964) by Ivan Ivanov-Vano, Thumbelina (1964) by Leonid Amalrik (1966) by Leonid Amalrik, (1964), (1965), Film, Film, Film (1968) by Fyodor Khitruk, by Boris Stepantsev (1965) (1966), (1967) by Vyacheslav Kotyonochkin, (1967) by , (1967) by , by Lev Atamanov (1967), (1969), An Alarm Clock (1967) by Lev Milchin (1969) by Lev Milchin, (1968) by the Brumberg sisters, The Little Mermaid (1968) by , and sports animation films (1963), Puck! Puck! (1964), (1968) and (1970) by Boris Dyozhkin. In 1968, Yuri Norstein and made a directorial debut with an unscheduled film . In 1969, the animated anthology series Happy Merry-Go-Round was founded. The first release was produced under the direction of Roman Kachanov by the beginning directors Anatoly Petrov, Gennady Sokolsky, Leonid Nosyrev, and , the world-recognised masters of animation today. The famous to this day and the first artistic presentation of Well, Just You Wait!, which was soon turned into a popular series of its own, were released exactly in the first run of Happy Merry-Go-Round. Experimental technologies, audacious concepts and innovation solutions were often used in the production of the shorts. The period from the beginning of the 1970s to the middle 1980s is called the halcyon days of Soyuzmultfilm. At that time, it became the largest animation studio in Europe, that employed more than 500 people and released more than 1000 films. In the late 1960s and early 1970s, the most popular cartoons appeared: The Bremen Town Musicians (1969) by Inessa Kovalevskaya On the Trail of the Bremen Town Musicians (1973) by Vasily Livanov, the series based on the fairy tale novel by Eduard Uspensky Gena the Crocodile (1969), Cheburashka (1971), Shapoklyak (1974), Cheburashka Goes to School