Some of them sang and prayed, and many of them – such as Dominican Sister Elise Garcia and Mercy Sister JoAnn Persch – said they had no option but to participate in the act of civil disobedience to speak out against the failure of Congress and the Trump administration to help the young adults.

"I have never been arrested in my life, but with the blessing of my community, I am joining with two dozen other Catholic sisters and Catholic allies to risk arrest today as an act of solidarity with our nation's wonderful, beautiful Dreamers," said Sister Garcia. "To our leaders in Congress and in the White House, I say 'arrest a nun, not a Dreamer.'"

She said she was there to support those like Daniel Neri, a Catholic from Indiana who was present at the event and would benefit from any legislation to help the 1.8 million estimated young adults in the country facing an uncertain future.

"What are we doing to the body of Christ when are hurting families? When we are hurting people?" he asked.

He also said, he wanted people to know that "we are not criminals, we are not rapists, we are good people."

Young adults called "Dreamers" -- a reference to the DREAM Act, one of the proposed pieces of legislation that could help them stay in the country legally -- have to go through extensive background checks, he said, and they wouldn't pass those checks if they were troublemakers.

Jesuit Father Thomas Reese said he was representing Jesuits from the West Coast and other Jesuits, who know exactly who "Dreamers" are.

"They are our students, sitting in our classrooms, they are our parishioners, kneeling in our churches," he said. "They are our friends, they are our colleagues who have invited us into their homes."

"Getting arrested today on Capitol Hill protesting in favor of Dream Act. #Dreamers#DACApic.twitter.com/3E5t1Wfdu3

— Thomas Reese, S.J. (@ThomasReeseSJ) February 27, 2018

Pointing to the U.S. Capitol building, where lawmakers gather, he said, "it is time for the people who work in that building to realize that this is a moral issue. It is a justice issue, and the political gamesmanship must stop."

Sister Persch said she was there, too, to support Dreamers. She took part in what was billed a "Catholic Day of Action With Dreamers," organized by the PICO National Network, a faith-based community organization based in California, largely out of frustration, she said.

"My prayer, my work for comprehensive immigration reform has had no impact on this administration," she said. "I stand with Dreamers now at this moment of truth, which to me is a moral issue. When these traditional strategies we have used have no impact, we have to move to action that could involve taking a risk to disrupt this unjust system in some way."

And if that meant being arrested, she was willing to do so, she said.

"As a woman of faith, I am called to be wise... courageous, a prophetic voice," she said. "That is a challenge to every person who says they are a Catholic, a Christian, a person of faith. And this applies to Paul Ryan as well as all those in Congress."

House Speaker Ryan, R-Wisconsin, is Catholic and many said they took issue with what they see as his lack of action on several issues involving immigrants. At various moments, including one near the U.S. Capitol, the crowd chanted, "Paul, Paul, why do you persecute me?" referring to the speaker.

In the rotunda, many of those who risked arrest, began by joining hands, singing hymns and praying "Hail Mary." They included Father Reese, along with Sisters Garcia and Persch. U.S. Capitol Police began warning them repeatedly to stop or be arrested. Of the 30 or 40 arrests, eight were Mercy Sisters.

Bishop Stowe extended his hands in the air and said: "We stand with the Dreamers, we are one with the Dreamers. And now I ask God's blessing upon those who are acting in civil disobedience, part of a long-standing tradition of not supporting unjust laws."

Shortly after, they were asked to put their hands behind and were placed in plastic handcuffs and led away, some in prayer, some singing. They were charged with disorderly conduct, crowding, incommoding and obstruction. By 4 p.m. (local time), they had all been released.

Just as those who were arrested at the Capitol were stepping out of out their comfort zones, so, too, the young adults they were advocating for are facing an even greater discomfort, the bishop said, as they face their greatest moment of uncertainty.