what does the reader infer about twains attitude towared slavery and racism?

This book was band in many schools and libraries in America for a long time. I think there might still be places where it is not welcome. The accusation is that it is racist and somehow condones slavery. People who condemn it are missing the point here. Twain was only writing within the context of the time. Racism and slavery were a way of life in the American south. Still Twain's characters are sympathetic to ideas of freedom and justice for blacks in America. Joe, for example, is a likeable young man.He cares for his family and is loyal to Huck. Joe holds good human traits that few of the white characters have. Huck and Joe's relationship is based on friendship rather than any sort of dominant/subservient investment. When Tom and Huck attempt to free Joe from his prison Twain gives us the symbolism of freeing the blacks from oppression on a wider scale. Twain doesn't outright condemn the racial bigotry of the time but he comes as close as he can get without being locked up himself!