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Meeting dishonest ex-supervisors at large international conference — Should one speak out?

I have returned to my country after one negative experience as a postdoc in China. In short, I was hired based on false salary & funding expectations supported by shady vague contracts written in Chinese. I stayed until the end as to escape a raging crisis at home.

Now I am back home, among long-date colleagues & collaborators. A large international conference in our field of study starts today. The very same PIs who lured me into their trap are coming, now in my country, actively seeking for new candidates. Surely they expect me to treat them politely, coldly at best. These people owe me a lot of money, plus stolen time and project ideas.

I think they expect me to stay nice and quiet for fear of getting bad recommendations and in the hopes of perhaps getting paid/compensated in the future. The culture here is certainly different from what they expect. In just few hours I will meet them at the conference hall, for the opening.

I am revolted. At least in my country, LoRs are not required for getting jobs, and I do not think they're too influential outside of their institutions.

Should I openly expose them? Or would that just label me as some begrudged nuthead?

There is one special roundtable about work ethics included, and I am thinking of approaching the organisation about this. Any suggestions, ideas on this, would be appreciated.

P.S. This is not in the US.