The Park Service, which permits around 750 First Amendment demonstrations annually in the national capital region, granted one last week to Mr. Kessler. “In anyone’s recollection, there has never been a First Amendment permit that’s been denied,” said Mike Litterst, a Park Service spokesman. “There wasn’t much discussion or question of whether or not it would be issued.”
Last year in Charlottesville, neo-Nazis, Ku Klux Klansmen and other members of hate groups marched through the University of Virginia campus shouting anti-Semitic slogans, then fought with counterprotesters in the city streets. A man who espoused neo-Nazi views is accused of driving his vehicle into the counterdemonstators, killing a 32-year-old woman, Heather D. Heyer.
The chance of that kind of spontaneous mayhem has led to weeks of planning between Washington’s law enforcement agencies, which have developed proposals to guard marches leading to the rally and the rally itself, as well as deal with any confrontations that precede or follow it in the streets of Washington.
Sgt. James Dingeldein of the Park Police said his agency, the Washington police and the Park Service had met with Mr. Kessler and leaders of counterprotest groups to explain to them what is permissible on the grounds of the park. The Park Service has issued a detailed set of limits and prohibitions on items that can be brought in, banning some of the items that were wielded in Charlottesville. The Washington police have vowed to keep the groups separated.
“If there is potential for violence, it will be dealt with quickly,” Sergeant Dingeldein said.
Federal officials have expressed concern that violence could spill into other parts of Washington. Sergeant Dingeldein said the police agencies had riot control teams ready.
James Murray, an assistant director in the Secret Service’s Office of Protective Operations, warned in a letter on Monday to the Park Service that it was possible that tension between groups could lead to the same kind of violence that occurred in Portland, Ore., last weekend, where a right-wing rally turned violent after, the police said, a group began throwing rocks and bottles at officers.