This book looks like it could be an interesting read:
A Complicated War: The Harrowing of Mozambique (Perspectives on Southern Africa)
A Complicated War combines frontline reporting, personal narrative, political analysis, and comparative scholarship to present a picture of a Mozambique harrowed by profound local conflicts—ethnic, religious, political and personal. Finnegan writes that South Africa's domination and destabilization are basic elements of Mozambique's plight, but he offers a subtle description and analysis that will allow us to see the post-apartheid region from a new, more realistic, if less comfortable, point of view.
The book was published in 1992 and the author, William Finnegan, mentions an encounter with the Jehovah's Witnesses in Malawi during his visit to Africa. I have not read the book yet, but this is the quote from Google books:
...As we neared Phalombe, we passed a big, extremely neat, canico village. "Jehovah's Witnesses," Tauzene said. The village was obviously new and looked unusually well built. The huts were large with separate cookiing huts, separate shower huts with L-shaped entrances, graneries, gardens full of greens, wells with fences around them and stairways down into them, latrines that were clearly well reinforced. "they are very industrious," Tauzene said.
They are more than that. A veteran correspondent living in Zimbabwe once told me that the only thing that united nearly all African governments was their hatred and persecution of Jehovah's Witnesses. Frelimo had expelled thousands from the cities. Many of those Mozambican Witnesses had ended up fleeing from Remino into Malawi, where the persecution was actually worse. A large number of Malawian Witnesses had been reportedly killed in 1967 for refusing to pledge allegiance to the Banda governement and more than one thousand fled into Mozambique. The Witnesses living near Phalombe, I had heard, were Malawians who had fled to Mozambique and had recently come back - on the assumption that they would be safe from persecution if they lived near the big refugee camps that were getting all the international attention. If they actually had only recently returned to Malawi, they would have had to cross.....
...and that is where the next page is missing. I guess I will have to try to get the book.