California it is well known to be an "At will"employment. Most states in US are under the same law. Which means, you can get fired with no reason at all. Proper documentation in these circumstances is not needed. I believe this law is retarded and it is the main reason why stellar performers are let go.
Until this law doesn't change, human rights are non-existent.
No one should be a victim because someone else with a higher function that thinks it's "almighty" will remove individuals based on personal "liking". I recall a post where someone stated that he got 6 out of 7 performance report and was still let go.
This is just unfair.