I know one person joined in the company with 7 years Fake Experience. I would like to inform to the employer on this how to complain it.?

Update: I applied to a job, I did not get the job. but I know someone join the job with 7 years fake experience.
that person has not have even 1 day real experience. I want to complain it to the employer. please suggest me "how to complain about it"?
Update 2: How to complain about it anonymously. Please tell me the ways to inform it to HR manager anonymously.
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