Anyanya leaders united behind him , and nearly all exiled southern politicians supported the SSLM .
In 1971 Joseph Lagu , who had become the leader of southern forces opposed to Khartoum , proclaimed the creation of the Southern Sudan Liberation Movement ( SSLM ) .
Anyanya leaders united behind Joseph Lagu , and nearly all exiled southern politicians supported the SSLM .
In 1971 Joseph Lagu , who had become the leader of southern forces opposed to Khartoum , proclaimed the creation of the Southern Sudan Liberation Movement ( SSLM ) .