The unity government is dominated by Hamas but includes several Fatah members and independents.
Many of those eventually arrested were Fatah members in the security apparatus, which was apparently meant as a signal: no one is immune.
The list included names of approximately 1,300 prisoners, some of whom were high-ranking Fatah members.
And some Fatah members behaved more independently than their leader liked.
Some fellow Fatah members paid a call on Khader while I was there.
Several hours after the announcement, 17 Fatah members were released.
In this attack, six Fatah members hijacked a bus and killed 35 Israeli civilians.
Fatah members gathered in the streets of Gaza City, shooting their weapons to celebrate.
When the shooting ended around daybreak, two Fatah members and one Hamas member were dead.
Fatah members initially led the fighting in the second intifada.