Well there are now many instances of enforced disappearances.[1] To what the administration likes to call jails in Ecuador, except for the fact jails and prisons are part of legitimate criminal justice systems with judicial review/due process. These can be more accurately described as concentration camps given that they lack the features that would make them legitimate jails or detention facilities.
[1] https://www.ohchr.org/en/special-procedures/wg-disappearance...
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[Enforced disappearance] is characterized by three cumulative elements (defined in A/HRC/16/48/Add.3):
A) Deprivation of liberty against the will of the person;
B) Involvement of government officials, at least by acquiescence;
C) Refusal to acknowledge the deprivation of liberty or concealment of the fate or whereabouts of the disappeared person.
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If you think about the administration's unwillingness to comply with the court's ruling to return the individual, who by their own admission, they mistakenly took away due to an "administrative error" there are many open questions. How do we know that the individual is still alive? For that matter, how do we know that all the other people who they say were removed from the country are still alive?
We have no independently verified information as to fates of these people. More likely than not, in the course of these actions by the government, the number of deaths is some number greater than zero. Even if they have not performed outright executions, some deaths as a result of the conditions and or their treatment in custody is almost certain. So is that state sanctioned man slaughter/murder? Does this make ICE a death squad?
https://en.wikipedia.org/wiki/Death_squad