"The Korean War Controversy: An Intelligence" Topic

…Success or Failure?.

"Less than three years after its creation, the CIA became involved in its first "hot war" after North Korea launched an invasion of South Korea on June 25, 1950. The new Agency conducted an array of espionage and covert operations unilaterally and in support of US Armed Forces taking part in a UN coalition.

The most persistent controversy about the CIA and the Korean War concerns whether the Agency warned US policymakers that North Korea would attack its southern neighbor. As is typical in situations involving warning, the reality is complex, and a collection of declassified CIA documents help dispel widely held assertions that the Agency committed a serious intelligence failure…"
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Amicalement
Armand

One can't "commit a serious intelligence failure", since intelligence failures are really more passive, and not done on purpose, at least most of the time (political expediency, and threats, notwithstanding).

Intell failure was just one of the negatives. That and the USA not prepared at all after the downsizing after WWII.

The US wasn't prepared. Dean Acheson's speech to the United Press Club created the impression we were "writing off" Korea. We were getting US troops out as fast as possible and had a very unrealistic view of what the ROKs could accomplish… poor intel on North Koreans. The prep for the June 1950 invasion was seen as, at worst, "just another rice raid" of the sort of skirmishes that had been going on for months.