It is the Law of Allah that Muslims should have a leader. In the End Times, Muslims will gather around thespiritual leadership of Hazrat Mahdi (as)

No matter what ideas or beliefs they hold, peoplealways have a leader
to represent them when they come together for aspecific purpose.
Throughout history, Allah has created every community of believers
together with a leader. The Prophet Noah (as) was the leader of
believers in his time, the Prophet Moses (as) was the leader of
believers inhis time, our Prophet (saas) was the leader of the
Companions in his time, Talut was the leader of believers in his time,
and Dhu'l Qarnayn in his time. In the same way that no community of
believers has ever been leaderless in the past, neither will Muslims
be leaderless in the End Times. Hazrat Mahdi (as) himself will
personally be the spiritual leader of Muslims in the End Times.
The idea that Muslims should be leaderless, when the Catholics, the
Orthodox, Jews and evenfreemasons have leaders, ignores the pains and
sufferings of the Muslim world. Allah commands Muslims in the Qur'an
not to be divided and fragmented.If Muslims do not abide by this
command of Allah's, if they fail to coalesce, as the Muslims of the
past coalesced, around one spiritual leader, then it will not be
possible for the difficulties and pains facing the Islamic world to
come to an end or for Muslims who are oppressed and persecuted all
over the world to be set free. The path that Allah shows to Muslims in
the Qur'an is that of "those who, when they are wronged,defend
themselves." (Surat ash-Shura, 39) It isblatantly evident that Muslims
are being wronged in Pathani, Afghanistan, Iraq, Palestine, Chad,
Moro, East Turkestan and manyother places. That being the case, it is
also evident that Muslims should be united in order to defend their
rights in the wisest and most effective way with knowledge, culture,
information and art. It must not be forgotten that "Allah loves those
who strive in His Way in ranks like well-built walls." (Surat as-Saff,
4) It is Hazrat Mahdi (as) in person who will bring the Muslims of the
worldtogether in our own dayto strive on Allah's path with knowledge
and information, who will show them the way, andwho will protect them
against the scourges of Darwinism and materialism in the finest
manner.
The responsibility for innocent people being bombed as they pray in
mosques in Pakistan, for our East Turkestan brothers being subjected
to unbelievable tortures in Chinese prisons, for Palestinian children
being shot at as they travel to school, for civilians in Iraq living
with the fear of death every day, for innocent people being bombed
asthey lie in hospitals in Afghanistan, for those who have spent long
years in refugee camps and for those who worship in secret in order to
stay alive, lies with those who are unwilling for Muslims to unite
around a spiritual leader. Those who maintain that Muslims should be
leaderless andheadless, ignoring the verses of the Qur'an and the
trustworthy hadiths of our Prophet (saas), must not ignore that fact.