These groups collectively vote for the candidate or political party that is willing to repay them for their votes with privileges and or immunities that are not available to everyone else.
Because of their numerical strength, they are able to transfer the wealth of their political opponents into their own pockets.
Despite what many believe, might does not make right. In a Republic, all of the people have the same rights and responsibilities. If all people in a society are not equal under the law, there can be no justice.