A persistent southron myth, but a myth nevertheless. None of the Maryland legislature was ever arrested until September of 1861. By that time the rebellion was well underway and those who would have supported joining it were liable for arrest.
Being a Stalin prototype, he also rounded up any suspected sympathizers closed down any freee press that would not spew the Federal claptrap. No trials, so many dissenters and innocents were placed in concentration camps for the duration. The NY Slimes and Maureen Dowd would be apoplecetic.
You do have it bad, don't you? No myth too outrageous for you to swallow?
Please tell me again how the CSA during its 10 day forays into Maryland imported slaves through the blockade under its own banner. Any slave ships arriving anywhere during the war would have flown the flag of oppression and tyranny (Federal Flag).
During both the 1862 campaign and the 1863 campaign, soldiers of the Army of Northern Virginia rounded up free blacks in Maryland and Pennsylvania and sent them back south into slavery. The total abducted runs into the hundreds, perhaps thousands. And you also have to remember that there were hundreds of blockade runners flying the flag of oppression and tyranny (confederate flag) on their runs from the southern state and places like Cuba. It would be highly unlikely if none of the captains of those ships didn't slip a slave or two through the blockade on their return run.