Paul Miller, a former Muay Thai fighter, white supremacist and online broadcaster known for his racist rants, pleaded guilty Tuesday to charges of stockpiling ammunition in his Florida home.

Paul Miller, who was arrested on a gun charge, will stay in jail until his trial, a judge ruled. Miller is considered a white supremacist with a following on Telegram.

Sometimes Paul Miller dressed as Batman’s nemesis, the Joker — face paint and all. Other times he wore army-green tactical gear with a red armband adorned with a swastika. But in each video ...