SAN FRANCISCO, March 4 : A big tech industry group consisting of major Anthropic backers Amazon and Nvidia on Wednesday expressed concern over the Pentagon's decision to declare the artificial intelligence company a supply-chain risk as other investors raced to contain fallout from the lab's fight with the U.S. Defense Department. In a letter dated Wednesday, the Information Technology Industry Council, whose members include Nvidia, Amazon.com, Apple and OpenAI said "We are concerned by recent