I'm watching Ken Burns' the Civil War at present. It just highlighted an event I'd never heard of the 1863 NYC draft riots.
Lincoln introduced the draft for able bodied men up to age 44. However, if you were able to pay a fee you could avoid it and find a substitute.
On the day the List of the Dead of Gettysburg was posted in July 1863 the first draftees were similarly listed and posted in New York City.
A mainly Irish mob rioted and took over the East Side killing some Blacks (and whites including Irish who tried to defend them) They were fearful of the blacks as both groupings were competing for the same, lower paid, jobs and some Democratic politicians fomented dissent / fear mongered - freed blacks would supposedly flood the NYC labour market.
Eventually order was reinstated 3 days later - by units returning from Gettysburg
The New York City Draft Riots of 1863
New York City draft riots - Wikipedia, the free encyclopedia
Aplogies to McTell who I just spotted posted the wiki link on another thread (Irish at Fredericksburg)