They were arrested for just being there. This is absolute bullshit. In the 90s, there was a protest camp there against the Gulf War that was there 24/7. I know because I was in it sometimes, helping to cook food and do other things to keep it a place to live in.
In the 80s, there was a semi-permanent shantytown there to protest South African apartheid.
This is utter bullshit.
So fucking nuts. Dunn Meadow has a long history of hosting student protests. My dad was a professor and he told me about the anti-Vietnam protests there in the 60s when students occupied the park.