Answer:
The Supreme Court case that established the "shackles" of the Constitution for President Lincoln was Ex parte Merryman.
Explanation:
This case arose during the Civil War when President Lincoln suspended the writ of habeas corpus in order to deal with the threat of rebellion. Chief Justice Roger Taney, in his ruling, declared that only Congress had the power to suspend the writ of habeas corpus, not the President. This decision was a significant moment in American history as it highlighted the delicate balance of power between the branches of government and the importance of upholding the Constitution even in times of crisis. President Lincoln's response to the ruling further underscored the tensions between executive power and judicial authority during times of war.