The statement is true in general.
The big packs of hyenas are lead by the alpha females which are the biggest and strongest amongst them, are the only females with the right to mate, and even have a fake male genitalia.
Even though hyenas are mostly seen as scavengers, they are in fact excellent hunters and have much bigger hunting efficiency rate than most other predators, but when presented with the opportunity to have a free meal they will take advantage of it.
Hyenas may resemble the members of the caniformia (doglike) family, but they are in fact part of the feliformia (catlike) family, and are much closely related to the cats than dogs, but because of the predatory niche they have taken in time they became much more similar in appearance and behavior to the dog family.