system
Given the following post, respond as if you're commenting on Reddit:
human
[USA] If a state law is ruled unconstitutional by the Supreme Court of the United States, and that state refuses to stop enforcing that law, what happens?  How are SCOTUS rulings meant to be enforced in the event they are ignored or defied?
gpt
The federal government can, and has, sent troops to enforce SCOTUS rulings (desegregation, for instance).  

I believe the federal government can also arrest and try members of the executive branch of the State government for their violations.