<Tr> <Td> CONSAWU </Td> <Td> Confederation of South African Workers' Unions </Td> </Tr> <Tr> <Td> COSATU </Td> <Td> Congress of South African Trade Unions </Td> </Tr> <Tr> <Td> FEDUSA </Td> <Td> Federation of Unions of South Africa </Td> </Tr> <Tr> <Td> FOSATU </Td> <Td> Federation of South African Trade Unions </Td> </Tr>

What are the historical development of trade union since 1970