Mumbai- Retired supreme court judge Markandey Katju is once again in the news for his tweets . This time, the MNS is his target. The MNS recently threatened to beat up Indian film producers and directors willing to work with Pakistani artists. Katju has challenged MNS with a tweet - ''MNS members. Is this how you show your bravery, threatening helpless people? If you have guts, come to me. I have a danda waiting for you." After the Uri attacks, MNS had taken an anti-Pakistani artists stance and had asked them to leave India immediately. The MNS is yet to react to this tweet.