London-based Action for Southern Africa has teamed up with the Trades Union Congress (TUC) to run a new campaign on HIV.
Fifty thousand leaflets, calling for greater financial support for HIV sufferers in Africa, have been distributed to the supporters of both groups.
An accompanying letter urges recipients to forward the leaflets to the Government's international development secretary, Clare Short.
The campaign, which calls for Britain to make a greater contribution to the global fund to fight Aids, will include adverts in the Big Issue Scotland and TUC newsletters.
The initiative has won the backing of African organisations involved in fighting the HIV virus.
Action for Southern Africa spokeswoman Clare Riches said: "We are building on our good relationship with the TUC, which was keen to get involved because HIV is a big workplace issue in Africa."