Founded in 1956 by Chaudhry Ghulam Rasool, this was an offshoot of the Qadianis that focused on publishing books about the character of Mirza Mahmud Ahmad and the 'tyranny' of the Khilafat.
Although the Qadiani organisation had always been very authoritarian since the Organisations in 1914, the post-independence atmosphere in Pakistan was one in which the old deference to authority was being replaced by a confident class that wanted answers. This movement was coinciding with a global revolution in thinking – something that led to Vatican II. With the paralysis of Mirza Mahmud Ahmad as a result of an assassin's attack, the Qadiani organisation never understood the need for re-calibration, thus developing many cult-like tendencies.
Link to an old letter from a Qadiani scholar to one of the Party's leaders: Letter from Abul Ata
In October 2010, Chaudhry Ghulam Rasool declared that he was a part of 'mainstream Islam' and that he did not believe that it was necessary for a Muslim to accept any of the claims of Mirza Ghulam Ahmad. Since his offshoot was from the Qadiani branch, this is essentially repudiation of the Ahmadiyya.