This week, in the first of two programmes, Man Alive examines the work of Community Relations Officers in the field, and the attitudes of immigrants to them. Race relations in this country today is a growth industry. Books surveys, committees, trusts, regulations - abound. Tough immigrant controls on one hand are said to betray a fear of future racial strife. On the other hand good intentions towards immigrants, particularly black immigrants, are expressed in the Community Relations Commission. This was established by the Race Relations Act in 1968 and charged with a wide brief: 'To encourage harmonious Community Relations and to encourage measures adopted for that purpose by others'. The intentions are good, but how effective is the Commission?