growing up in the soviet union, alexander cherkasets used to tell his mother that someday he would move to america. despite what they heard in school, he and his friends thought of the united states as a bulwark of truth and justice. in 1979 the dream came true. cherkasets, then almost 30, quit his job at a moscow travel bureau, won an exit visa and emigrated to new york city. but there, driving a taxi, he watched his dream ture sour. he came looking for something close to the prefect society, he says, and he didn't find it. in 1982 cherkasets went to the soviet embassy in washington and asked to reture home