Is it illegal for the security department of Guangzhou Sunshine Hotel to recruit people from other units without buying social security?

It is legal for hotels to outsource security services to security companies, and they have established an equal contractual relationship with security companies.

As for the security personnel recruited by the security company, their social security should be purchased by the security company. According to national regulations, security companies must buy social insurance for the security personnel they recruit, and their failure to buy social insurance violates national laws and has nothing to do with hotel companies. Regarding the behavior of security companies not buying social security, they can choose to complain to the local labor inspection and security brigade.