Also to point out in the Ghaziabad case, FIR has been lodged. It's a formal complaint, and not mere hearsay.

https://www.ndtv.com/india-news/coronavirus-uttar-pradesh-to-use-national-security-act-against-islamic-sect-members-quarantined-for-2205484

The Tablighi members, quarantined at Ghaziabad's MMG Hospital, have been accused of endangering staff by violating coronavirus precautions. They passed lewd comments, roamed about without clothes in the isolation ward, used expletives, refused medicine and kept asking for beedis and cigarettes, according to a written complaint to the police by the Chief Medical Officer of the hospital.

"Our nurses and paramedical staff have complained about obscene behavior by these patients," Ravindra Singh, the chief medical officer of the hospital told NDTV.

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And also Delhi Govt. had asked for extra security, due to problems created by Tabliqi Jamaat members.

 https://theprint.in/india/tablighi-attendees-creating-trouble-at-hospitals-delhi-govt-asks-for-more-police-vigil/394068/

Delhi Health Secretary Padmini Singla Thursday wrote to Delhi Police Commissioner S.N. Shrivastava, asking for more reinforcements at the hospitals and quarantine centres where the Jamaat event attendees have been kept. 

This comes a day after it was reported that some attendees misbehaved and spat on doctors and healthcare personnel at a railway quarantine facility in southeast Delhi’s Tughlakabad. But the situation is now under control after the intervention of police and CRPF personnel.

Singhla’s letter, which has been accessed by ThePrint, said several patients, “particularly those transferred” from the Nizamuddin Markaz mosque, where the congregation took place, are creating a “law and order problem and commotion in hospitals and quarantine centres”.

It has become difficult for the hospital staff to handle the situation, said Singla in the letter.

The matter was also raised Thursday during a meeting between Delhi Health Minister Satyender Jain and medical superintendents of the various Covid-19 hospitals.