Yes, they do. One reason is when wolves have rabies, but these only account for about half the times that wolves eat people.
Wolves rarely attack people in North America . . . a lot of the reported cases were exaggerated or completely false, due to an economic incentives for inventing such incorrect data. However such reports are not entirely false, and are likely to increase as wolves and people become more likely to come into contact with each other in the future.
The affects of wolves on livestock in America are not significant in general, being a small fraction of those which die from natural causes.
The same applies to wolves killing dogs in America . . . it does happen, but is only a very tiny effect on the population.
Livestock and dogs, as well as people in Europe and Asia are more likely to be killed by wolves than in America.
For more details on this, see The Wikipedia data on “Wolf attacks on humans”
Agression and warning, the intensity of its gaze an expression of the power of its determination for survival and freedom.
For more great wolf photos, see our Blog post . . . Wolf Photos