Protesters fined during Saturday's Black Lives Matter demonstration are prepared to challenge the penalties in court, according to a Belfast law firm representing more than 25 of those affected.
The fixed penalty tickets and Community Resolution Notices (CRNs) were issued as up to 1,000 people gathered at the main anti-racism rally in Custom House Square in Belfast and another in Londonderry.
The Black Lives Matter demonstrations were protesting in the wake of the killing of George Floyd in the US.
But the organisers will be reported to the Public Prosecution Service for allegedly breaching social distancing regulations, the PSNI said.
Ciaran Moynagh, a solicitor with Phoenix Law in Belfast, said the firm is hoping to negotiate with the PSNI to suspend or remove the fines, but added that his clients remain defiant that they will take the matter to court if required.
More than £12,000 has also been raised by activists online in order to pay the fines of some - a move branded "disgraceful" by DUP MP Gregory Campbell.
Mr Moynagh said: "We are always willing to enter into dialogue and we will want to engage with the police.
"We hope they hold these fines in abeyance and see if a resolution can come about, in which they are either quashed or some agreement is reached on them.
"If we can't do that then yes, these people have the right to go before a court and challenge the fines.
"Our clients' ultimate goal is that the fines handed out yesterday are null and void and that they don't have to pay."
Mr Moynagh and protest organisers claimed the PSNI response was "disproportionate" and argued that decisions on individuals fined on the day were not consistent.
"Yesterday, attending a rally that was socially distanced was no more dangerous or risky than attending the Ikea queue or going to the local supermarket," Mr Moynagh added.
"There have been other events and other gatherings in NI such as beaches and parks which are not socially distanced and there has been no fining there.
"Whilst the police may have advised and educated these people attending, they were also very selective.
"Not everyone received a fine and scrutiny will have to be brought upon why certain people were fined and other people were not. We have instructions from couples who were together. Police spoke to both and only issued a fine to one and not the other."
The solicitor also accused the PSNI operation conducted at Custom House Square of inadvertently endangering social distancing rules by "corralling" people into certain areas.
"The police had ring-fenced and provided key areas around Custom House Square and one of the main entrances to Custom House Square is to the right of the Albert Clock," he explained.
"Officers were stopping people there on the footpath which is next to a main road and discouraging them from proceeding past, advising if they did go past they would be fined or prosecuted.
"That resulted in a large mass of people in a very restrictive area not able to socially distance and therefore their actions were counter-intuitive to protecting the public."
The PSNI was not able to provide a response to the claims by the time of going to press.
Yesterday, Assistant Chief Constable Alan Todd said the PSNI had conducted checks on a number of travel routes and advised people to return home.
He added: "I believe that these actions had a positive effect on reducing the number of people attending the protests, thereby protecting the public from the spread of the coronavirus.
"We estimate there were less than 500 people in attendance at each event and a significant number of Community Resolution Notices (CRNs) and fines were issued in both Belfast and Derry/Londonderry.
"As I have said previously, in other times, we would have been working with the organisers and protesters to facilitate a lawful and peaceful protest to mark the avoidable and unnecessary death of George Floyd; however, these are not ordinary times."
He added: "A number of individuals, including organisers, will now be reported to the Public Prosecution Service with a view to prosecution. We will also conduct follow-up enquiries to seek to identify others who may have committed offences."
Mr Campbell said the PSNI had a duty to pursue action against organisers and those attending, and said he hoped any future demonstrations would be "scaled back".
"The content of what people are protesting about is not the consideration - the consideration is if they are in breach of the law," he said.
"In the aftermath of the protest, the police must be seen to pursue the issue."
He said the protesters' cause "is of consideration only for the court to take into account, in terms of mitigation, but it doesn't allow you to break the law".
"They were warned on numerous occasions in the media and I understand police turned up at both events ahead of time to publicly warn them that they were in breach of the law.
"Everyone needs to focus on getting through this pandemic."