Treaties — Operation of — Effect of municipal legislation — Whether treaty provision repeals prior le~islative provision — Havana Convention on Aliens, 1928, Article 6 — The law of Costa Rica.

Aliens — Expulsion of — Right of expulsion — Treaty limitation upon — Grounds for expulsion — Relevance of status as permanent resident — Havana Convention on Aliens, 1928, Article 6 — The law of Costa Rica.