Well David, if Howard is right, that it is right and proper for each state to do just as it pleases Show Trials would be nothing out of the ordinary, nevertheless...
The most recent example is from China and concerned the death of a UK citizen, the defendant 'may or may not have been'* Bo Xilai.
*It has been reported that there is widespread use of Surrogate Defendants in criminal trials in China.
But, as we both go back a bit David, who can forget the wonders of the USSR...
http://thenewamerican.com/culture/history/item/4679-recalling-the-moscow-show-trials
Then of course, here in the UK we have had one or two from the HoCs and the HoLs as exemplars in our 'fight' against corruption.