Janata Party chief Subramanian Swamy has dragged the name of Karti P. Chidambaram, son of the Union home minister, in the case of the Aircel-Maxis deal being probed by the CBI. Swamy released a letter he had written to Prime Minister Manmohan Singh on Wednesday along with a set of documents, which Swamy claims that they point to the involvement of Karti in the controversial Aircel-Maxis deal.