The Enforcer. Stargazer Series, #2

Book 2 in the Stargazer Series Diamond's team, the Protection Task Force, is called upon when an American judge is kidnapped. It's vital that she's found, as humans carrying sympathy to the Stargazer cause are rare and hard to come by.  Especially those in power. But can he reign in his explosive violence when he realizes the kidnapped judge is his? Judge Felicia Ruge is connected to the US government.
An informant. An important job, because she relays facts without tainting the government against the Stargazer aliens who landed on Earth not long ago. However, if one alien can taint her, it's Diamond. The man looks more primitive warrior than human. His code name-Enforcer, and he tempts her to break all the rules. Including the one to remain unbiased. Other books in the series:The Hunter The Enforcer The Defender The Protector The Guardian The Destroyer  In 1692, a starship carrying volunteers arrived on planet Earth to a small town called Salem, Massachusetts.
The long journey across many light years caused the female inhabitants aboard drastic memory loss. It was already known when they would arrive on Earth, they would have no memories of who and what they really were. They would be as helpless as newborn lambs. The goal was to breed with Earthlings, to prevent their own race from dying out. If it was successful, years later more Stargazers would be sent to co-exist with the humans on Planet Earth.
But alas-the females were slaughtered.