A 77-year-old woman has been charged with distributing heroin as part of a mid-level drug ring.

She was arrested after police raids in the affluent Sydney suburb of Potts Pt following a four-month investigation on Wednesday morning, according to the Daily Mail.

Three women and two men were also arrested for their alleged involvement in the drug syndicate, and charged with drug supply and participating in a criminal group.

NSW police also raided homes in Sydney's Neutral Bay, Surry Hills and Darlinghurst as well as regional city Albury in southern NSW.

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The drug syndicate is alleged to have been distributing heroin in the Potts Pt area but managed from Albury.

One of the alleged leaders of the group, a 51-year-old woman, was charged with 30 counts of supplying a prohibited drug and one of ongoing supply.

She appeared in court yesterday and was refused bail.

Another alleged leader, a 51-year-old man, was charged with drug-supply offences and directing a criminal group.

He is due to face Albury Local Court on April 18.

The 77-year-old woman will appear at Downing Centre Local Court on May 10.

Police have also charged a 58-year-old man and 61-year-old woman for participating in the criminal group and for possession of an illegal substance.

They will appear separately in front of the Manly and Downing Centre local courts on April 18.

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A 39-year-old woman was charged with drug supply and participating in a criminal group and appeared in Central Local Court yesterday.