Attorney General William Barr, who was nominated to the position by President Trump last year, as ordered that the federal death penalty be reinstated.

The federal government hasn’t executed an inmate since 2003 when courts halted them over concerns about the controversial combination of three drugs used to kill inmates. In response to Barr’s announcement, the Bureau of Prisons has scheduled execution dates for five men currently on federal death row in December and January. All have already used all of their available appeals.

For context, since the 1970s, when the Supreme Court ruled that capital punishment could resume, the federal government has only executed three inmates.

The federal government will now use a single drug— pentobarbital—to carry out the executions.

Currently, there are about 60 inmates on federal death row, including high profile criminals like Boston Marathon bomber Dzhokhar Tsarnaev and Charleston church shooter Dylann Roof.