Oh, yes. Screech CASTRO before you bother finishing the quote. How transparent.
But a very moderate use ought to be made of this right, and only in important or necessary cases. Liberty is the soul of abilities and industry: frequently a mechanic or an artist, after having long travelled abroad, is attracted home to his native soil by a natural affection, and returns more expert and better qualified to render his country useful services. If certain extraordinary cases be excepted, it is best in this affair to practise the mild methods of protection, encouragement, &c., and to leave the rest to that natural love felt by all men for the places of their birth.
Castro agreed with Vattel that citizens should only be held captive so long as they remained useful to the State. Castro, like Vattel, was happy to let some citizens escape if he didn't want or need them anymore.

Like Vattel, Castro just believes that the State has first claim on the labor of its citizens.
Don't you agree with Vattel about that feature of citizenship?
Don't you believe in natural law?