ICE concedes that 109 of the immigrants arrested had no criminal record. The remaining 61 had criminal records, but ICE wouldn’t specify what those were. 

…Prior to the Trump administration’s rule change, immigration enforcement wasn’t the point of the background information the Office of Refugee Resettlement collected. Their goal was to make sure the sponsors could keep the children safe, enroll them in school, and provide them with an attorney for their court appearances. During the month of May alone, 658 children were separated from their parents and the new rule has the effect of keeping them in federal custody longer than necessary.

Totally Non-Evil ICE Arrests 170 Immigrants Trying To Save Babies From Baby Jails – Wonkette

hmmmm