I was a kid when all this stuff was happening. There was Zodiac and Zebra and the SLA.
Now isn’t the only tine things were going crazy.
Thie Zebra killings were Nation of Islam inspired if I’m not mistaken.
In a related matter I tried to get that book from the SF library. They only had 1 copy that they retrieved from an archive and you only had 30 minutes to look at it while you sat at a table and a library employee watched you.
I finally got a copy at used book store