BOOM!! TEXT WALL!!!
EDIT: By the way, no one is really sure how many chapters are out there, they only keep 1000 chapters on the books, but the Dark Angels are proof enough that there is a lost of stuff kept off the record. The rule the Dark Angels break is the one about not having more than 1000 marines, they break that rule by making all of the chapter masters, of the Dark Angels successor chapters, report to the Grand Master.
EDIT: By the way, no one is really sure how many chapters are out there, they only keep 1000 chapters on the books, but the Dark Angels are proof enough that there is a lost of stuff kept off the record. The rule the Dark Angels break is the one about not having more than 1000 marines, they break that rule by making all of the chapter masters, of the Dark Angels successor chapters, report to the Grand Master.