The following month , on 4 January 1976 , Jackson supposedly organised the " Glenanne gang " 's two co-ordinated sectarian attacks against the O'Dowd and Reavey families in County Armagh , leaving a total of five men dead and one injured . Weir maintained that it was Jackson who shot 61-year-old Joseph O'Dowd and his two nephews , Barry and Declan , to death at a family celebration in Ballydougan , near Gilford ; although Jackson had not been at the scene where the Reavey brothers had been killed twenty minutes earlier . The day after the double killing , ten Protestant workmen were gunned down by the South Armagh Republican Action Force , who ambushed their minibus near the village of Kingsmill . The shootings were in retaliation for the O'Dowd and Reavey killings . The Glenanne gang made plans to avenge the Kingsmill victims with an attack on St Lawrence O'Toole Primary School , Belleeks . This plan , which involved the killing of at least 30 schoolchildren and their teacher , was called off at the last minute by the UVF 's Brigade Staff ( Belfast leadership ) , who considered it " morally unacceptable " and feared it would have led to a civil war
O'Dowd and Reavey
Reavey and O'Dowd killings
Robin Jackson