Wagner, the principal at Woodbury High School, school staff were informed that a student had a gun and were bringing the ...

The incident on the bridge in August involved a man from New Hampshire who, officials said, killed his wife and child.

More than 19,000 people were wounded in shootings in Chicago since 2018. The Chicago Police Department has made arrests in 1,200 of those cases.

This Wall Street Journal documentary traces Wagner's evolution from a small, guns-for-hire operation into a sprawling network of businesses that has been active on four continents.