There are none.
However, there are many all black companies.
I even went to a head hunter abotu a job, and he took one look at me and said, "This company won't hire you. They only take Indians". (meaning from Asia)
I had a manager in my own company - who came from India - tell me that he would only hire people from India. "They work like slaves and never question what I tell them to do," he said.
There are racists everywhere. But a "birther" is not a racist. A birther simply wants the constitutional mandate that a President or Vice President be born in the USA to be taken seriously, and that a person running for the highest office in the land should be able to prove that they do. There are other variations - but this is the core of it