I came across a website just yesterday that tried to say JW's taught that Abaddon was Satan and the Locusts were demons from Hell. I did an extensive trawl through the literature and could find nothing to prove that theory. The publications have always pointed to Abaddon being Jesus and the Locusts being so called witnesses. Even the Aid book (blue one) which is not on the CDROM.
The Watchtower Society did indeed at one time in the past, teach that Abaddon was Satan -- here's the quote:
Studies in the Scriptures, Volume VII, Page 159:
?And there were stings---Revivals in which the attendants were stung, doctrinally and financially. AND in their tails WAS their power to hurt men five months---One hundred and fifty years, from Wesley?s ordinance in 1738 to the casting off of Methodism in 1878--Rev. 9:5
They have THEIR king---the same king as exercises general rulership over the ecclesiastical affairs of the present evil world. The angel of the abyss---?the prince of the power of the air? ----Eph. 2:2
Whose name in the Hebrew tongue is Abaddon---and he is ?a bad one? sure enough---2Cor. 4:4.
But in the Greek tongue hath his name Apollyon---That is, Destroyer. But in plain English, his name is Satan, the Devil.?