Pakistan vowed to end its tolerance of so-called "good" militants after a Taliban massacre at a school in Peshawar in December killed 153 people, the worst terror attack in the country's history.
The government's list of 60 or so banned organisations features the Pakistani Taliban and secessionist rebels from Balochistan province, but the state has long shied away from action against groups considered useful for fighting abroad in India or Afghanistan.
But JuD denies any link to violence, and within Pakistan the organisation enjoys a high degree of popularity for the work of its charitable arm.
Following a UN Security Council resolution, Pakistan said it had frozen the group's assets after the Mumbai attacks -- an undertaking it has repeated in recent weeks.
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Like the Palestinian group Hamas and Hezbollah of Lebanon, JuD has set up a network of health and education facilities across Pakistan, including five hospitals, 200 dispensaries, ambulance services and 250 schools.
When AFP visited Al Aziz hospital, elderly women were lining up in a white corridor for eye tests.
"Laser eye surgery is free," said Hussain. Further ahead, two dentists worked their way through their daily quota of 40 patients each.
Despite the bounty, he also leads a high-profile public life and regularly delivers fiery anti-India speeches.