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President Trump’s assertion that a gang is committing crimes in the United States at the direction of Venezuela’s government was critical to his invocation of a wartime law last week to summarily deport people whom officials suspected of belonging to that group.

But American intelligence agencies circulated findings last month that stand starkly at odds with Mr. Trump’s claims, according to officials familiar with the matter. The document, dated Feb. 26, summarized the shared judgment of the nation’s spy agencies that the gang was not controlled by the Venezuelan government.

The disclosure calls into question the credibility of Mr. Trump’s basis for invoking a rarely used wartime law, the Alien Enemies Act of 1798, to transfer a group of Venezuelans to a high-security prison in El Salvador last weekend, with no due process.

The intelligence community assessment concluded that the gang, Tren de Aragua, was not directed by Venezuela’s government or committing crimes in the United States on its orders, according to the officials, speaking on the condition of anonymity to discuss internal deliberations.

Analysts put that conclusion at a “moderate” confidence level, the officials said, because of a limited volume of available reporting about the gang. Most of the intelligence community, including the C.I.A. and the National Security Agency, agreed with that assessment.

Only one agency, the F.B.I., partly dissented. It maintained the gang has a connection to the administration of Venezuela’s authoritarian president, Nicolás Maduro, based on information the other agencies did not find credible.

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