The idea that the state would wither away was later abandoned by Stalin at the 18th Congress (held in 1939), in which he expressed confidence that the state would exist, even if the Soviet Union reached communism, as long as it was encircled by capitalism. Two key concepts were created in the latter half of his rule; the "two camp" theory and that of "capitalist encirclement". The threat of capitalism was used to strengthen Stalin's personal powers, and Soviet propaganda began making a direct link with Stalin and stability in society, claiming that the country would crumble without the leader. Stalin deviated greatly from classical Marxism when it came to "subjective factors", claiming that party members, whatever rank, had to profess fanatic adherence to the party's line and ideology, and that otherwise those policies would fail.