The Silk Letter Movement (Tehreek-e-Reshmi Rumal) refers to a movement organised by the Deobandi leaders between 1913 to 1920, aimed at freeing India from the British rule by allying with Ottoman Turkey, Imperial Germany, and Afghanistan. The plot was uncovered by Punjab CID with the capture of letters from Ubaidullah Sindhi, one of the Deobandi leaders then in Afghanistan, to Mahmud al Hasan another leaders then in Persia. The letters were written in silk cloth, hence the name.