He rarely appears in public and has been renamed as the Khuddam-e Islam.
Azhar is usually present at the Difa-e-Pakistan council rallies but his public appearances, compared to Hafiz Saeed of the JuD, are extremely rare.
The organisation is based in south Punjab where it has a seminary and affiliated schools.
Analysts say the JeM has also massacred several Shias in Pakistan. In 2012, the interior minister of Pakistan had named the JeM as one of two banned outfits behind the killing of Shias in the country.
The outfit continues to have close links with the ISI but of late, due to its activities within the country, seems to have fallen out of favour with the security establishment.
Guru was found guilty of conspiring with and sheltering militants, who attacked the Indian Parliament in December 2001, and of being a member of the banned Islamist group, the Jaish-e-Mohammed.
The JeM’s primary motive is to separate Kashmir from India and it has carried out several attacks primarily in Indian-administered Kashmir, where a separatist conflict has cost up to 100,000 lives since the insurgency began in 1989, according to rights' groups.