It is an organization which brings together the blocks involved in elections of overseer in the Vault 11. The coalition handed out voting guides to vault dwellers in Vault 11. The most influential - Justice Bloc. This provided the leadership election Roy Gottlieb. As a result of a power struggle, the Coalition is crumbling after losing unity.
The Coalition of Vault 11 Voting Blocs is only mentioned in Fallout: New Vegas.