It's 50 years since president richard nixon took a gigantic diplomatic gamble to visit chairman manterdom in the capital of red china. This was a trip to a commonist country whose existence america did not even recognize. David renniy is the economists baging bureau chief, and writes chagan au column on ch China. Susanna Reid: I think they thought that it would finally be an opportunity for their persecutors to be held accountable. She says this time around people have less hope that a court will bring an end to their suffering.