About ten people representing Survivors of Child Abuse and survivors of the Magdelene Laundries are demonstrating to highlight their disgust at the refusal of Cardinal Seán Brady to resign as Primate of All Ireland.
SOCA spokesperson John Kelly said it was a small dignified protest.
He said thousands of people had wanted to come but as emotions were running so high they felt it would be wrong to do so.
But he said they wanted to send a clear message to the Vatican that no longer would people be able to get immunity from crimes that happen in this country.
About 30 people representing Lesbian Gay Bisexual and Transgender Community were also protesting outside.
They say the Catholic hierarchy opposes equal rights for LGBT people and they are calling for separation of church and State.