also expressed concern over the "recent apprehension" regarding the reforms due to "the possibility that foreign forces"—those of the Warsaw Treaty Organization—"may intervene in Czechoslovakia's internal development." If this were to happen, Vaculík argued: …the only thing we can do is to hold our own and not indulge in any provocation. We can assure our government—with weapons if need be—as long as it does what we give it a mandate to do. Impact of the "Two Thousand Words" Despite the overall moderate tone and Marxist–Leninist orthodoxy, the "Two Thousand Words" called for action on the part of the public in case of military intervention and therefore denied the leading role of the party, as Vaculík's 1967 speech had. It was popular throughout Czechoslovakia with both intellectuals and workers, and its popularity only increased after the party officially condemned it. It also significantly increased the concerns of the Soviet Union. Following the "Two Thousand Words," Leonid Brezhnev's party leadership, seeing a situation similar to that in 1956 Hungary developing, used the term "counterrevolution" to describe the Prague Spring for the first time. If a counterrevolution was taking place (and the Soviet Union was increasingly disposed to categorising the events in Czechoslovakia as such, as other radicals continued to act and Dubček failed to gain their confidence), socialism as the Soviet Union saw it was threatened and invasion by Warsaw Treaty Organisation troops, as occurred 20–21 August 1968, was deemed justified. This policy of the acceptability of using force wherever socialism was thought to be threatened would become known as the Brezhnev Doctrine, and Vaculík's "Two Thousand Words" was an integral step toward this early application of it. Vaculík as a dissident After Gustáv Husák came to power in 1969 and censorship increased, Vaculík (now no longer a party member) was part of the circle of dissident writers in Czechoslovakia. In 1973, he started Edice Petlice (Edition Padlock), a samizdat series that he ran until 1979. Others followed with their own series, despite harassment from the party's secret police. Some samizdat authors, including Vaculík, were also published in the west. The core of the samizdat authors eventually developed and signed the foundation document of Charter 77; Vaculík attended the second of the planning meetings in December 1976. On 6 January 1977, Vaculík, along with Havel and Pavel Landovský, an actor, attempted to take a copy of the charter to the post office