An operation in Geylang on Oct 2 last year led to the arrests of 159 men and women, police revealed on Tuesday.
The suspects were apprehended for various offences under the Women's Charter, immigration act and misuse of drug act.
Led by the Bedok Police Division the project involved more than 170 officers from the Criminal Investigation Department, the Police Intelligence Department and the Special Operations Command. The raids were carried out at Lorong 14, Lorong 16 and Lorong 24 in Geylang.
One of the suspects was a 47-year-old man who was arrested in the vicinity of Police Cantonment Complex. He had allegedly provided and sold information of the movement of police vehicles to crime syndicates operating in Geylang. Officers seized two binoculars, one telescope and two walkie-talkie handsets found in his possession.
Also seized during the operation were 18 communication devices and a motorised bicycle. These were believed to have been used to keep tabs on the police to hinder enforcement action.
Six of the suspects are alleged to have intentionally obstructed the course of justice, an offence punishable by a jail term of up to seven years. Three more suspects allegedly assisted in the management of a brothel, which carries a maximum punishment of a $3,000 fine or a three-year jail term under the Women's Charter. Another three allegedly committed both offences.
Investigations against the remaining suspects are ongoing.