Our Prophet (saas) mentioned in his hadith that Hazrat Mahdi (as) will have 313 followers. But among these people, he will have a group of 30 people who assist him in his studies. Our Prophet (saas) has revealed that these people will assist Hazrat Mahdi (as) with the easy obtaining of information in preparing his works that communicate the existence and oneness of Allah and intellectually demolish such pagan conceptions as Darwinism and materialism and in matters requiring time and labor so that he does not have to spend his own valuable time on them. These people will be experts in their fields and will have the knowledge to assist Hazrat Mahdi (as) in those matters where he has not the time or means.
With the STRONG THIRTY ALLIES OF IMAM [Hazrat Mahdi (as)], he is not in lonely. (Bihar al-Anwar, 52:153
These believers who will assist Hazrat Mahdi (as) in the performance of his three tasks will have powerful faith and conscience and will be intelligent, devout and pure. They will not leave Hazrat Mahdi (as) alone in his work of causing the moral values of Islam and the Sunnah of our Prophet (saas) to rule the world.
In addition this group will constantly support Hazrat Mahdi (as) in his work of intellectually demolishing Darwinism and materialism and bringing all Muslim countries together under the umbrella of the Turkish-Islamic Union, thus establishing a major power, and will never leave him alone.