Harassment in California is unlawful whether perpetrated by supervisors, coworkers, clients, or third parties

https://www.scribd.com/document/995680211/California-Sexual-Harassment-Can-You-Sue-Individually-Named-Harassers-156716

Harassment in California is unlawful whether perpetrated by supervisors, coworkers, clients, or third parties, and employers must take reasonable steps to prevent it.