This is a US case from 1980
Rodriguez- Fernandez arrived from Cuba to claim asylum. He was detained.
The man had previous convictions in Cuba. He was on trial for burglary at the time of his escape.
Usages of nations can be used to resolve issues where there is no treaty see the Paquete Habana case
The Attorney General was allowed to refuse to release the man on parole. His habeas corpus rights were not violated since he could elect to return to Cuba.
The AG was right to do what he did in light of the man’s turpitudinous past.