This is a relatively simple legal issue. Limitations on free speech are permissible if they are reasonable time, place and manner restrictions. You can't rule against the content of a person's message, but for safety and other reasons, you can relocate or reschedule someone's expression of it.
For instance, SOS would never get permission to protest outside the Governor's private home at 3:00 in the morning. The police would be in their right to move us to the capital building and tell us to shut it down by 7:30 at night.
What Redondo Beach is trying to do is simply too restrictive or it's not, in view of the danger the workers' conduct is causing the public. It's a question for the Supreme Court. The 9th Circuit (the appeal court that issued the ruling) is commonly overturned.
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