In the early 1960s, the Economy of Czechoslovakia became severely stagnated. The industrial growth rate was the lowest in Eastern Europe. Food imports strained the balance of payments. Pressures both from Moscow and from within the party precipitated a reform movement. In 1963 reform-minded Communist intellectuals produced a proliferation of critical articles. Criticism of economic planning merged with more generalized protests against KSČ bureaucratic control and ideological conformity. The KSČ leadership responded. The purge trials of 1949-54 were reviewed, for example, and some of those purged were rehabilitated. Some hardliners were removed from top levels of government and replaced by younger, more liberal communists. Jozef Lenart replaced Prime Minister Viliam Široký in September 1963. The KSČ organized committees to review economic policy.