Federal law in this instance. The latest group that has indicated online and in other places that theyre going to come is this oath group that is known to carry arms in a very public way. In california alone, since the december 2015, weve had two dozen violent public political demonstrations. Reporter professor brian leaven with the study of hate and extremism at cal state says many rallies have involved White Nationalists. He recommends police keep opposing sides separate and help create laws against tools of violence. No masks, no sticks. Antimasking ordinances and laws are very important so we can identify people who feel emboldened by their anonymity. If its an unsafe event, we can shut it down. Reporter San Francisco police chief bill scott has been working with the park service to create conditions, meant to keep the public safe. There are conditions that can be placed in a permit to prohibit weapons within the permitted space. Reporter but that doesnt necessarily mean there wont