Dubcek carried the reform movement a step further in the direction of liberalism. After Novotny's fall, censorship was lifted. The media--press, radio, and television--were mobilized for reformist propaganda purposes. The movement to democratize socialism in Czechoslovakia, formerly confined largely to the party intelligentsia, acquired a new, popular dynamism in the spring of 1968. In April the KSC Presidium adopted the Action Program that had been drafted by a coalition headed by Dubcek and made up of reformers, moderates, centrists, and conservatives. The program proposed a "new model of socialism," profoundly "democratic" and "national," that is, adapted to Czechoslovak conditions. The National Front and the electoral system were to be democratized, and Czechoslovakia was to be federalized. Freedom of assembly and expression would be guaranteed in constitutional law. The New Economic Model was to be implemented. The Action Program also reaffirmed the Czechoslovak alliance with the Soviet Union and other socialist states. The reform movement, which rejected Stalinism as the road to communism, remained committed to communism as a goal.

The Action Program stipulated that reform must proceed under KSC direction. In subsequent months, however, popular pressure mounted to implement reforms forthwith. Radical elements found expression: anti-Soviet polemics appeared in the press; the Social Democrats began to form a separate party; new unaffiliated political clubs were created. Party conservatives urged the implementation of repressive measures, but Dubcek counseled moderation and reemphasized KSC leadership. In May he announced that the Fourteenth Party Congress would convene in an early session on September 9. The congress would incorporate the Action Program into the party statutes, draft a federalization law, and elect a new (presumably more liberal) Central Committee.

On June 27, Ludvik Vaculik, a lifelong communist and a candidate member of the Central Committee, published a manifesto entitled "Two Thousand Words." The manifesto expressed concern about conservative elements within the KSC and "foreign" forces as well. (Warsaw Pact maneuvers were held in Czechoslovakia in late June.) It called on the "people" to take the initiative in implementing the reform program. Dubcek, the party Presidium, the National Front, and the cabinet sharply denounced the manifesto.

The Soviet leadership was alarmed. In mid-July a Warsaw Pact conference was held without Czechoslovak participation. The Warsaw Pact nations drafted a letter to the KSC leadership referring to the manifesto as an "organizational and political platform of counterrevolution." Pact members demanded the reimposition of censorship, the banning of new political parties and clubs, and the repression of "rightist" forces within the party. The Warsaw Pact nations declared the defense of Czechoslovakia's socialist gains to be not only the task of Czechoslovakia but also the mutual task of all Warsaw Pact countries. The KSC rejected the Warsaw Pact ultimatum, and Dubcek requested bilateral talks with the Soviet Union.

Data as of August 1987