See:

https://www.translatorscafe.com/tcterms/IT/question.aspx?id=...

Also see:

R.C. OPERAI
(EMPLOYERS' LIABILITY) Trattasi della "Responsabilità Civile Operai", più correttamente definita R.C. prestatori d'opera, riguardante: la rivalsa dell'I.N.A.I.L. ex artt. 10 e 11 del DPR 1124/65; le pretese del lavoratore danneggiato per il maggior danno (a prescindere dal danno biologico) rispetto alle prestazioni I.N.A.I.L ed eventualmente il danno biologico subito dal lavoratore stesso. Tali rischi sono coperti dalla polizza R.C. generale, attraverso l'apposita sezione di questa, indicata mediante la sigla R.C.O.

http://www.studiobroker.it/news/20-glossario?start=5

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Note added at 28 mins (2020-10-02 10:59:10 GMT)
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Also employer's liablity insurance

http://mcmahonsolicitors.ie/employers-liability-insurance/
https://www.investopedia.com/terms/e/employers-liability-ins...

What Is Employers' Liability Insurance?

Employers' liability insurance, sometimes known as employment practices liability insurance (EPLI), protects employers from financial loss if a worker has a job-related injury or illness not covered by workers' compensation. Employers' liability insurance can be packaged with workers' compensation insurance to further protect companies against the costs associated with workplace injuries, illnesses, and deaths. Employers' liability insurance is also called “part 2” of a workers’ compensation policy.

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Note added at 29 mins (2020-10-02 11:00:14 GMT)
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Or employers' liability insurance (depending on the context) referring to 1 or more employers