Habeas Corpus. He jailed pro-Confederate political leaders in Maryland, for the urgent reason of keeping that state loyal. Otherwise, Washington DC would have been entirely surrounded by enemy states.
Lincoln suspended habus corpus. Davis didn't have the constitutional right.
Abraham Lincoln
habeaus corpus
So that he could keep some of its pro-Southern leaders in jail, and prevent the state from voting Confederate.
Habeas Corpus. In Maryland, he jailed some pro-Southern politicians, in order to keep this border-state onside.
It wasn't a who, it was a what: he suspended habeas corpus.
He has the great distinction of being the only president ever to declare Martial Law and suspend all civil rights, arresting media reporters who wrote articles which he deemed oppositional and sending them to prison.
Lincoln blocked Confederate ports to prevent trade from 1861 to 1865.
The right of "habeas corpus".
suspend the writ of habeas corpus
Because of the risk of Maryland voting Confederate. It would have left Washington DC totally surrounded by enemy states. Lincoln jailed Maryland's pro-Southern leaders without trial, so that their voice could not be heard at this critical time.
The president does not have the power to unilaterally suspend civil rights or liberties in the United States. The suspension of civil rights would require an act of Congress or a declaration of martial law by the president, under limited circumstances. However, even in those situations, the suspension would be subject to legal challenges and constitutional scrutiny.