Also, with absolute strictness and mercilessness they...
Also, with absolute strictness and mercilessness they imposed economic embargo on His Eminence and all this was as a result of malice and jealousy that these evil people had harbored against the Holy Imam for the following reasons: Firstly: His Eminence, Imam Hasan Askari (a.s) was the most eminent personality of his times, as a big portion of the Muslim community regarded him as their Imam and leader. And it did not support the tyrannical rule of the Abbasides and were not in favor of it.
Rather they were in the forefront of opposition to the oppressive Abbaside regime and their view was exactly opposed to the Abbasides to the extent of even criticizing and denouncing them. Therefore, the Abbasides behaved with utmost severity and force with His Eminence.
Secondly: The Abbaside rulers were absolutely terrified of the son of His Eminence and the Awaited Imam whom the Messenger of Allah (a.s) had prophesied that he would be his last vicegerent and the unique reformist who would establish the system of absolute justice and equity and wipe off all oppressions and injustice, because they were certain that their oppressive rule would be destroyed at his hands.
That's why they tried to murder Imam Hasan Askari (a.s) time and again so that his progeny is cut off just as some letters of His Eminence state. In letters that he wrote to some of his Shia followers it is mentioned: “They thought that they could plan to murder so that my progeny may be cut off.
And the Almighty Allah rendered their word and their plots ineffective and thanks and gratitude is to the Allah, the High.” The above letter was written after the birth of His Eminence, the Awaited Imam (a.s). Thirdly: The Alawite Sadats raised standards of revolts in various areas against the tyrannical and despotic rule of the Abbasides in order to establish justice and restore the rights of humanity that had been trampled by the Abbasides.
These uprisings were supported in sections of the society and Muslim community. Naturally this was a matter of great consternation for the Abbasides who became deadly foes of anyone who was even suspected to be an Alawite and they wreaked upon them the worst of the tortures and atrocities. At that time Imam Hasan Askari (a.s) was a pivot and a great personality and obeyed by everyone. Therefore he was the target of the wrath and enmity of the Abbaside tyrants.
Thus they subjected him to the worst of the tortures, atrocities and pressures.