Eight defendants have been arrested and charged with distributing “millions” of misbranded opioid pills imported from India, including Tramadol, and mailing them out to customers in what the feds describe as a large-scale operation being run primarily from a warehouse in Queens.

The defendants are Ezhil Sezhian Kamaldoss, Harpreet Singh, Parthiban Narayanasamy, Baljeet Singh, Deepak Manchanda, Gulab Gulab, Mukul Chugh and Vikas Verma.

They’ve all been charged with conspiring to possess a synthetic opioid with intent to distribute the potentially lethal substance and Kamaldoss has also been charged with money laundering.

According to a news release from the US attorney’s office in Brooklyn, the defendants maintained detailed ledgers of how much product they were sending out and who they were mailing it to. The feds have been on to them since January 2018, the release states.

The defendants were arrested on Thursday morning and hauled before a magistrate judge in Brooklyn for an initial appearance.

If convicted, Kamaldoss could face up to 25 years in prison while the rest of the group face five-year maximum sentences.