A spokesperson for the Dublin Grassroots Network, which is organising anti-globalisation protests over the weekend, claimed the arrests were part of a campaign of Garda harassment ahead of celebrations to mark the accession of ten new countries to the EU.
Giuseppe Giardi, aged 38, a hostel worker, Neil Ketchley, a 19-year-old student and Polly Murphy, aged 20 and unemployed, were charged under Section 13 of the Criminal Justice (Public Order) Act 1994, which relates to trespass.
Giardi also faces a separate charge under the Criminal Damage Act 1991 which relates to possession of material with the intent of causing damage to property.
Anyone found guilty of either offence could face a prison term of 12 months and/or a €1,270 fine.
The court heard evidence from gardaí who arrested the three at a premises on Leeson Street Lower, Dublin, on Tuesday night.
All accused made no reply after being cautioned and charged at Harcourt Terrace Garda station. Inspector John Quirke of Pearse Street Garda station objected to bail on the basis that all three accused had originally claimed they had no fixed abode when arrested.
Insp Quirke said they had subsequently provided addresses in the Britain which had not yet been verified.
He added they may also face more serious charges.
Judge Patrick Brady remanded all three in custody with consent to bail. He fixed their bail at €450 each, plus an independent surety each of €1,500, with one-third of each sum to be paid into court.
On being granted bail, he ordered the accused to report to the Bridewell Garda station on Mondays, Wednesdays and Fridays. They must also surrender their passports, reside at an address within the State which satisfied the gardaí, and give gardaí 24-hour notice of any surety they would provide to the court.
Giardi and Ketchley were in custody to appear before Cloverhill District Court on May 5 next. Murphy was remanded to appear before the Dublin District Court on the same date.
It is understood mobile phones, crash helmets, spray cans and balaclavas, were recovered during a search of a premises on Leeson Street.
Dublin Grassroots Network spokesperson, Laurence Cox warned that the arrests “were unnecessary and will only serve to heighten tensions.”