The group are believed to have flown in recently as part of an organised begging operation in which Romanian gangs target Cork and other Irish cities. The group are primarily in their 20s and target Patrick Street and other areas of the city centre.
Paul Sheehan from Cork Simon said the group do not engage with the local homeless services and appear not to speak English.
The group is believed to have background help, with duvets and other bed clothing being removed during the day in wheelie bins which are transported in vans.
At a recent Joint Policing Committee meeting in Cork city, Chief Superintendent Barry McPolin said that almost 40 arrests had been made for begging in June.
The meeting heard that an average of 18 to 20 people a month are arrested for begging.
It was a new wave of begging following previous clampdowns late last year.
City businesses and members of Cork City Council have hit out at the situation, urging gardaí to increase their presence on the streets in a bid to solve the issue.
Under the law, begging is illegal only when those begging are causing an obstruction.