What do we do if SETI is successful?

former chairman of the board of the SETI Institute John Gertz:

'In fact, the author has heard from serious U.S. SETI researchers that they are convinced that “men in black suits” will appear at their laboratory door the moment a detection is confirmed.'

Source: https://arxiv.org/pdf/1701.08422

And yet no one is ever able to describe what agency or jurisdiction these "men in black suits" will work for.

This basically is just demonstrating how people very very good in their field can still fail Civics 101. Men In Black were some funny movies back in the day, but they were just movies.