When choosfilling two out of five professional and technical positions, all of the hiring processes are transparent and open, which is clear to every colleague.

I'm not 100% sure what you meant. I assume you are talking about when a company has a job that needs a worker. They are picking amongst the colleagues?

Some people have been blaming me and suingthreatening to sue me for failing to get what they want.

Did they sue you? Or just complain? Suing is only going to court itself.