Authorities say the group broke into more than 100 homes and cars, many of which were unlocked.
A middle school assistant principal prompted the investigation after he noticed a student trying to fence an item at school.
Authorities refuse to say what the item was.
Gallagher and Hails married on Jan. 4 and were arrested within days.
Four teens from Newtown Square, ages 13 to 17, are also charged.
