Iran's Revolutionary Guard has threatened attacks on a swath of U.S. tech companies with operations in the Middle East, including Nvidia, Apple, Microsoft and Google.The Guard warned on Tuesday that 18 tech companies would be considered as "legitimate targets" in retaliation for U.S. and Israeli strikes on Iran."From now on, for every assassination, an American company will be destroyed," they said in an Guard-affiliated Telegram channel.Attacks on those companies would begin from 8 p.m. on Wedn...