A Boeing 777 was chartered by China’s government to fly Huawei Technologies executive Meng Wanzhou back home last May, in the mistaken expectation that she was about to be freed, a Canadian ...

When Justin Stein, a security guard at the Chicago Mercantile Exchange Center, began searching bags and briefcases last fall, people expressed annoyance and some even left the building in protest.

But, though they look relaxed as they wave and smile at familiar cars, the guards are on high alert. “You really don’t have time to be bored,” head of security Harry Sprague said.