When Nguyen Truong Chinh last visited his son Nguyen Van Chuong, a deathrow inmate in Vietnam, they cried together ahead of his imminent execution for a crime they say he did not commit. Chinh, 77, has been campaigning to free his son -- whose murder conviction came after allegations of torture -- for 16 years, and faces regular harassment in a country whose hard-line communist administration stifles dissent.