But the purpose of the Communists in this kidnapping was to use the mother and son in forcing the father and daughter to return. Another. and more frequent tactic of the Communists. has been a letterwriting campaign. They have had friends and relatives in the satellite countries write letters to the refugee or escapee urging him to return. While the good life that awaits him if he returns may be the outward content of the letters. the hidden implication is there that something might happen to the loved ones left behind if he does not return. This is not a new form of blackmail. but the Communists have stepped up its use in their redefection campaign.