Hunting for a short story about earth having been isolated from the galactic civilization

I'm trying to find a short sci-fi story that I read some 40 years ago (in the early to mid 70's). Earth had been isolated with some force field as Humans were regarded as too dangerous/uncivilized by the galactic civilization, but something had happened and Humans were potentially needed to help.. The story was about earth being checked out to see if Humans were now safe enough or it would be even more risk to let them loose. The story ends with the force field being released and Earths moon being taken along by the Humans so that they would have something to remind them of home...

That's what I vaguely recall. Any pointers would be most appreciated.

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