Here is what I've found in Alaska newspapers.

"An altercation with fair security, caught on a more than nine-minute video and posted on YouTube, led to his arrest on charges of fourth-degree assault, disorderly conduct and trespassing, said Cmdr. Tom Remaley of the Palmer Police Department. The video has also sparked criticism that state fair security personnel used excessive force in detaining Hill.
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"I don't know why security wanted him to leave, but he was yelling that he had his right to free speech," Remaley said. "He also had a handgun on him, and they took him into custody. There were trying to get him on the ground and felt the gun."
Officials at the Florida State Fairground maintained that their private property rights superseded the man's constitutional right to free speech, and that other political protesters would be asked to leave as well.
"We not only have the right to (limit protests), we have a responsibility as well," a park official told the Frontiersman.
Something his wife says is simply unfair for someone who was practicing his freedom of speech.
"He was just exercising just that, his freedom of speech," said Erin Hill. "They let him in with the banner that's in your face and then turned around and tried to stop him after they let him after he paid admission."
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In an update by the Anchorage Daily News, a marketing director to the state fair attributed an "unwritten policy" of not allowing people to spread political messages unless they've paid a fee to rent a booth like other exhibitors.
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He was taken into custody by police after the incident. A judge opted against seeing him charged with assault, but Hill does face a count of trespassing and disorderly conduct. He was freed on $250 bail, according to reports.

Anchorage


And from Fairbanks

"When security personnel discovered Hill had a handgun on him, "that's when the whole thing changed," Phipps said. "All the supporters went away when they saw there was a gun."

"As Hill is on the ground, an off-duty Alaska State Trooper also intervened to help with crowd control, Phipps said.

"That's when the off-duty trooper stepped in," he said. "He felt that, at that point, it was a public safety issue because he was inciting people to come help him."

"For Valley residents, Hill is a familiar figure in downtown Palmer holding the same sign. For the most part, he's a peaceful protester, Remaley said.

"We've had complaints about him yelling at people in traffic or encroaching on traffic with his sign," he said. When Palmer police have responded, Hill has always complied and is within his rights to protest.

But at the Alaska State Fairgrounds, which is private property, the fair has the right to ask political protesters to leave. It's like a public school, where school property is owned by a school district, he said. If Hill or anyone were to show up and start protesting, they'd either need permission or leave if asked.

"That this is private property is a big issue as well," Phipps said. "We not only have the right to (limit protests), we have a responsibility as well. The key issue is that whatever rules we have have to apply to everyone."

"Hill, who had been held on $500 bail, was arraigned Friday afternoon at the Palmer Courthouse. Assistant District Attorney Trina Sears said her office decided not to prosecute Hill on the assault charge, but is going forward with the charges of disorderly conduct and trespassing. She also asked for, and was granted, an order Hill not return to the fair.

Hill's attorney, Josh Fannon, hushed his client's one attempt to address District Court Judge William Estelle, who reduced Hill's bail from $500 to $250. Hill posted bail and was released."