Why do you think people were sent back to their original countries if they had a prison records?

I think it's because it is to stop an international inccident....also, they are probably not trusted.

In the United States, the government did not want to deal with immigrants who were potential criminals. In cities with high immigrant population, crime rates also tended to be high, so immigrants that had a high potential to cause trouble were not welcomed into the nation.

Its because they are immigrants and they need to go back to there country.