In the nearly four years since supporters of former President Donald Trump attacked the U.S. Capitol building, federal prosecutors have indicted at least 35 current or former law enforcement officers for their role in the insurrection, according to an Intercept analysis.

Among their targets was Alan Hostetter, a former California police chief who entered the Capitol grounds with a hatchet in his backpack on January 6, 2021. He was sentenced to more than 11 years in federal prison late last year, among the longest sentences so far out of more than 1,500 prosecutions stemming from the events of that day.

Hostetter, who represented himself at trial, spouted a wide range of conspiracy theories during his closing argument, including that the 2020 election was stolen from Trump. The judge overseeing Hostetter’s case emphasized his experience as a police officer during the proceedings. “No reasonable citizen of this country, much less one with two decades of experience in law enforcement, could have believed it was lawful to use mob violence to impede a joint session of Congress,” U.S. District Judge Royce C. Lamberth said in court last year. In July, Lamberth denied Hostetter’s request to be released from prison while he appeals his case, noting that it’s too risky for him to be freed ahead of the “looming” November election. (Hostetter did not respond to efforts to reach him before his conviction.)

Before his journey from police chief in La Habra, California, to insurrectionist, Hostetter spent 22 years at the Fontana Police Department, a small agency in the mostly working-class region southeast of Los Angeles known as the Inland Empire. The area has a history as a hotbed for white supremacist views most commonly associated with the deep South, which have earned it the nickname “Invisible Empire”— a reference to the Ku Klux Klan.

For more than three years, filmmaker Stuart Harmon and I have investigated the culture of policing in Fontana. We spoke with several veterans of the local police department, including four whistleblowers who are featured in a new film published today by The Intercept. We also reviewed hundreds of pages of internal documents, interviewed residents and attorneys, and made several attempts to speak with the police department’s leadership. They declined to answer our questions.

In the aftermath of the 2020 killing of George Floyd in Minneapolis,........

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