"The United States' death penalty system is tragically flawed. Resuming federal executions -- especially by an administration that identifies itself as 'pro-life' -- is wrongheaded and unconscionable," said Krisanne Vaillancourt Murphy, executive director of Catholic Mobilizing Network, a group that champions restorative justice and an end to the death penalty.

The execution of five inmates on federal death row will take place from December 2019 through next January.

Attorney General William Barr said in a statement: "The Justice Department upholds the rule of law -- and we owe it to the victims and their families to carry forward the sentence imposed by our justice system."

The last time there was a federal execution was in 2003.

In 2014, President Barack Obama directed the Bureau of Prisons to conduct a review of federal capital punishment cases and issues surrounding the use of lethal injection drugs. According to the July 25 announcement, that review is complete and the executions can proceed.

Currently, there are 62 inmates -- 61 men and 1 woman -- on federal death row, according to the Death Penalty Information Center. Most of the federal death-row prisoners are at the U.S. Penitentiary in Terre Haute, Indiana.

Inmates in the group include convicted Boston Marathon bomber Dzhokhar Tsarnaev and Charleston, South Carolina, church shooter Dylann Roof.

Sister Helen Prejean, a Sister of St. Joseph of Medaille, who is a longtime opponent of capital punishment, tweeted a brief reaction to the July 25 announcement saying that as she was about to "board a plane to Alaska to join the celebrations of 62 years without the death penalty in that state" when she learned "the federal government plans to restart executions later this year after a 16-year hiatus."

"The DOJ regresses as the rest of our country evolves," she added.

In a statement released the afternoon of July 25, Sister Prejean described the Justice Department's announcement as a "seemingly measured statement," which "belies the fact that this is a rush to kill: They plan three executions in one week using a new, untested -- and not yet approved -- lethal injection protocol."

She also said it is "disheartening that the administration has chosen to follow the death road, when the life road calls us to work for justice for all."

Sister Prejean, echoing a message she has said before, added: "The death penalty is deeply flawed, with a terrible history of racism in its implementation and an equally terrible history of errors, resulting in many innocents on death row. We also know that it does not offer the healing balm to victims' families that is promised."

Federal death penalty cases are authorized by the Department of Justice in consultation with local U.S. Attorney Offices.

Vaillancourt Murphy said in her July 25 statement that in the 16 years since the federal government executed a death-row prisoner, the American public has changed its collective thinking on the death penalty. Last October, she said 49% of Americans said they believed the punishment is applied fairly and currently, 25 states have distanced themselves from the death penalty in some capacity, most recently, California, with its governor-imposed execution ban in March and New Hampshire's repeal of capital punishment by legislative veto override in May.

Hannah Cox, national manager of Conservatives Concerned about the Death Penalty, offered a similar response saying the reinstatement of federal executions "goes against the trend we have seen in states across the nation, where executions and sentences are at historic lows."

She also pointed out that a growing number of conservative state lawmakers "realize that capital punishment goes against their principles of valuing life, fiscal responsibility and limited government, and that the death penalty does nothing to make the public safer."

Vaillancourt Murphy reiterated that the Catholic Church's teaching is very clear on capital punishment, noting the Catechism of the Catholic Church calls it "inadmissible" in all cases "because it is an attack on the inviolability and dignity of the person."

She said the Justice Department's announcement "flies in the face" of American values of equality and fairness "and for Catholics, above all, a belief in the sanctity of all human life."

She said the decision also "promotes a culture of death where we so desperately need a culture of life."