But their defence barrister said what the three men did on February 3 was only silent prayer, and not a protest by any means.
Anti-abortionists Kerry Mellor, 76, John Popplewell, 76, and Ken Clancy, 79, have faced a hearing in the ACT Magistrates Court over their actions that day.
The three men had for years been part of a pro-life group that gathered outside the abortion clinic in the ACT Health building on Moore Street on Fridays, one of the days staff performed abortions at the clinic.
But in March 2016 the ACT government introduced an exclusion zone around the clinic and banned protest within the zone.
The court heard the group had once brought placards and props such as a crucifix to their public prayer vigils.
But once the law changed, they say they went there only to silently pray.
They did not gather in groups, did not bring bibles and one said he kept his rosary beads out of sight in a leather pouch on his belt.
Prosecutors allege the men continued to go there to protest in defiance of the zone.
On February 3 last year, Mr Mellor, Mr Popplewell and Mr Clancy were fined $750 for protesting in the exclusion zone.
But the three refused to pay their fines and were later summonsed to face court.
The men have all admitted they oppose abortion. Giving evidence on Friday, Mr Mellor agreed he was a devout Catholic who believed abortion was a mortal sin.
He said they were there that day to express a formal declaration of their opposition to abortions being performed at the clinic.
He said they all admitted being opposed to abortion and the court could infer from that their intention to protest that day.
Mr Walker said their history of opposing abortion and the context of why there were outside the clinic on that day was essential to what their conduct meant.
But defence barrister John Purnell SC said the men went to the clinic that day to communicate only with God. He said they went there to pray silently, and only silent prayer was done.
"Silent prayer is not a protest by any means," he told the court in his brief closing address.
He said what they did in the past was irrelevant, and they did not have any intention to protest on February 3.
Mr Purnell said no one who saw Mr Mellor outside the clinic that day could possibly construe he was "even praying, let alone protesting."
Magistrate Glenn Theakston said he will hand down his decision on March 9.