U.S. congressional examination of Chinese stock holdings in BlackRock funds built on MSCI indexes could presage a broader clampdown on U.S. institutional investment in such shares, analysts said, as Washington fears American capital could help Beijing gain military or technological advantages. Relations between the two countries are at a low point amid friction on issues including Taiwan and the Ukraine war. The Biden administration is weighing new restrictions on outbound private investment in China on top of existing bans on certain technology sales and other trade measures. A U.S. congressional committee said earlier this week that BlackRock and index provider…