The best way to shut up Altaf Hussein is to stitch up his mouth permanently so that he could never speak again and make ugly statements and mobile speeches against Pakistan from London. And, it should be a good lesson and fair enough warning for the MQM hate mongering politicians in Karachi that they would be dealt with the same way.
But, the question would remain how to feed Altaf Hussein if his mouth is stitched up? I would recommend that he is fed through his rectum for rest of his life. I am certain that by doing this, it should save Pakistan from a lot problems deliberately instigated by MQM to create hate mongering and violence.