Two top officials of the Tanzania Scouts Association (TSA) have been suspended amidst allegations that they were involved in people trafficking.
Police are investigating the disappearance of up to 50 young men and women during scout events in the US, Japan, Belgium and France since 2000.
The TSA says its officials were not involved in the disappearances.
Correspondents say there have been several recent cases of Tanzanians not returning from trips abroad.
TSA official Abdalla Sakasi told the BBC that the decision not to come back from jamborees abroad was a personal one - often made in conjunction with the parents.
He also said Tanzania's Education Minister Joseph Mungai had exceeded his powers in suspending the association's chief commissioner, Gosbert Njunwa, and executive commissioner, Alpherio Nchimbi.