life and on the further development of popular education in the USSR" (1958), adopted in 1959, along with introduction of a mandatory 8-year school education, made it possible for the parents of pupils to opt for non-mandatory studying of the "second language of instruction," which would be Belarusian in a Russian language school and vice versa. However, for example in the 1955/56 school year, there were 95% of schools with Russian as the primary language of instruction, and 5% with Belarusian as the primary language of instruction. That was the source of concern for the nationally minded and caused, for example, the series of publications by Barys Sachanka in 1957–61 and the text named "Letter to a Russian Friend" by Alyaksyey Kawka (1979). The BSSR Communist party leader Kirill Mazurov made some tentative moves to strengthen the role of Belarusian language in the second half of the 1950s. After the beginning of Perestroika and the relaxing of political control in the late 1980s, a new campaign in support of the Belarusian language was mounted in BSSR, expressed in the "Letter of 58" and other publications, producing a certain level of popular support and resulting in the BSSR Supreme Soviet ratifying the "Law on Languages" (""; 26 January 1990) requiring the strengthening of the role of Belarusian in state and civic structures. 1959 reform of grammar A discussion on problems in Belarusian orthography and on the further development of the language was held from 1935–1941. From 1949–1957 this continued, although it was deemed there was a need to amend some unwarranted changes to the 1933 reform. The Orthography Commission, headed by Yakub Kolas, set up the project in about 1951, but it was approved only in 1957, and the normative rules were published in 1959. These rules had been accepted as normative for the Belarusian language since then, receiving minor practical changes in the 1985 edition. A project to correct parts of the 1959 rules was conducted from 2006 to 2007. Post-1991 The process of government support for "Belarusization" began even before the breakup of the Soviet Union, with the Supreme Soviet of the BSSR passing a law on languages in 1990 that aimed for the gradual increase in prestige and general use of the Belarusian language over the next 10 years, followed by the creation that same year of a National Language Program to support this endeavor. After Belarus became