At present, subject to certain exceptions, anyone convicted of a "crime of moral turpitude" is inadmissible to the US, even on a B-1 or B-2 visa or through the visa waiver program. The seriousness of the offence is irrelevant; involuntary manslaughter is not necessarily a bar, but such minor offences as fare evasion and certain parking tickets (even if paid) potentially count. This harms trade with the US and deters tourists from travelling to or transferring within the US.
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