“Defense attorneys had argued their clients should not be held responsible for the actions of others, and called the prosecution politically-motivated, and an attack on First Amendment rights to free speech and association.”
The prosecution may not of had evidence that the defendants were the ones who acted violently.
They did not - or at any rate they did not present any evidence.
This story was posted and discussed yesterday, and it appears the prosecution failed miserably (for whatever reason) to make the case against these individuals.