MacReady
MacReady (coloquially referred to as "Mac") was a Human sheriff on the Skagaran planet, where a population of about six thousand Humans lived. 

MacReady was a reasonable man, but still believed that the "Skags" needed to be kept in check in order to protect the Humans. He enforced laws that prevented Skagarans from owning property or being educated. When Jonathan Archer visited the planet during the Xindi mission, he intervened and stopped the abuse of a Skagaran. MacReady told Archer to leave town. After Archer saved a local school teacher, he returned to the planet in a  to have a meeting with MacReady. The sheriff believed Archer's story and was preparing to visit Enterprise when his former deputy attacked and wounded MacReady. They were able to stop the deputies, and MacReady agreed to make changes in the treatment of the Skaragans. Archer promised him that he would return the Humans to Earth after the Xindi mission. ()

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Humans
Police officers