McCourt sold the Los Angeles Dodgers for a hefty sum in 2012. Here’s how he’s been building his business and media empire since, and setting up a potential consortium to purchase TikTok.

A lawyer for social media giant TikTok has warned the hugely popular app could “go dark” if a proposed US ban is upheld by the highest court in the land.

The Supreme Court on Friday seemed likely to uphold a law that would ban TikTok in the United States beginning Jan. 19 unless ...