Bizarre but true. Mayor Fernando Wood advocated setting up a "free city". There was quite a bit of antiwar sentiment, much of it stemming from a fear of freed slaves competing for jobs up north.
While we're on NYC, I also recently found out that the secretary of war designated the NYPD as provost marshalls in 1862. Detectives spent the rest of the war hunting saboteurs and spies all across the country. If anyone has any good links about this I'd appreciate it if they'd post them.
But Mayor Wood changed his position the moment Sumter was fired on. The 40th New York was called the 'Mozart Regiment' not after the composer but because Fernando Wood, as head of the Mozart Faction of the Democratic Party in New York City, was the sponsor of the regiment.