In Ireland (north and south) there are non-jury trials for "scheduled offences". These courts were originally set up to deal with cases arising from the conflict in this country, but lately the southern state, at least, has been using them for gangland/drug related trials as well. At the time they were set up, the justification was to prevent juror intimidation, although no cases of juror intimidation were ever demonstrated (witness demonstration yes, but that's obviously something that can happen with or without a jury).
As you'd expect, the conviction rate in these courts is pretty high.