During the Prague Spring events in Czechoslovakia, Andropov was a vigorous proponent of "extreme measures". He ordered the fabrication of false intelligence not only for public consumption, but also for the Soviet Politburo. "The KGB whipped up the fear that Czechoslovakia could fall victim to NATO aggression or to a coup." At that moment, Soviet intelligence officer Oleg Kalugin reported from Washington that he had gained access to "absolutely reliable documents proving that neither CIA nor any other agency was manipulating the Czechoslovak reform movement." But, Kalugin's messages were destroyed because they contradicted the conspiracy theory fabricated by Andropov. Andropov ordered many active measures, collectively known as operation PROGRESS, against Czechoslovak reformers.