Humans

"Human beings appear to be a slave race breeding on an isolated planet in a small galaxy. As such, the human race was once a source of labor for an extraterrestrial civilization and still remains a possession today. To keep control over its possession and to maintain Earth as something of a prison, that other civilization has bred never-ending conflict between human beings, has promoted human spiritual decay, and has erected on Earth conditions of unremitting physical hardship. This situation has existed for thousands of years and it continues today."

-- Quote by Charles Fort, The Book of the Damned, 1919

Taken from article here