By George P. Hassett

The trial of a man caught in the biggest drug bust in city history begins Tuesday in Middlesex Superior Court.

Raymundo Baez, no address, was arrested in June and charged with trafficking in heroin, committing a drug violation near a school zone and conspiracy to violate a drug law. He was arrested along with three others – Fiorlenis Jiminez, 22, of Mattapan, Xiomara Ortiz, 43, of Jamaica Plain and Ricardo Gomez, 38, of Providence, — in connection with what police allege was a large-scale heroin operation being run out of 49 Franklin St.

During the arrests police seized 941 grams of heroin – worth nearly $1 million on the street – a .380 caliber pistol and $5,625 in cash.

At the time of the arrests police said the crew was likely wholesaling the drugs to other, smaller dealers. Baez will be the first of the four to go to trial. Gomez defaulted on a court appearance and a warrant has been issued for his arrest, according to the Middlesex District Attorney’s office.

The investigation into drug dealing at 49 Franklin St. began six months before the arrests when neighbors lodged complaints about drug activity with police crime tip hotline and the city’s 311 constituent services line.

The bust was the biggest anyone in the department could remember. The previous high happened 15 years ago when 250 grams of cocaine was seized, police said. In the two years before the Franklin Street arrests the drug unit had not seen more than 30 grams of heroin at one time, said a police source.