This post is very simplistic.

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You live in a country called Politistan, you own a tech startup in which 75% of engineers are foreigners on a PL-VISA. A new party comes into power, and draft a proposal do abolish said visa.

Do you expect your employees - that could be at risk of not being able to renew their visas - to not discuss politics at work?

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I know my example is flawed, I don’t have a good proposal either, but hard “Don’t, just don’t” isn’t enough for extreme cases.