Tablighi Jamaat, the global organisation of Islamic missionaries, which may be the biggest carrier of Covid-19 infection in India, has had a long history of ties with Pakistan-based banned terror outfits like Harkat-ul-Mujahideen.
The original founders of Harkat-ul-Mujahideen (HuM), the terror group known for the hijacking of Indian Airlines Flight 814 in 1999, were members of Tablighi Jamaat, as per Pakistani security analysts and Indian investigators.
Formed in 1985 as a splinter group of Harkat-ul-Jihad-al-Islami (HuJI), HuM participated in the jihad backed by Pakistan against Soviet forces to overthrow the USSR-allied regime in Afghanistan. As per intelligence estimates, over 6,000 Tablighis were trained in HuM terror camps in Pakistan.
Both HuM and HuJI terror groups operated in Kashmir after the defeat of Soviet Union in Afghanistan, killing hundreds of civilians. The HuM cadre eventually joined the Jaish-e-Mohammad terror outfit founded by Masood Azhar, who had been released by India in exchange of IC814 passengers.
As per WikiLeaks documents, some of the 9/11 al-Qaeda suspects detained by the US in Guantanamo Bay had stayed in the premises of the Tablighi Jamaat in Nizamuddin West, New Delhi, several years ago.
Incidentally, Tablighi Jamaat was also suspected to be involved in the burning of 59 Hindu Kar Sevaks in the 2002 Godhra train torching incident in Gujarat, which led to communal rioting in the state that claimed several lives.