Well....
Honestly? Nearly all of them. This statement of course will require a bit of qualification.
I find the vast majority of States to be either a) Clearly violent, exploitative, and coercive all the time b) Only selectively violent, exploitative, and coercive with some justification for it's otherwise abhorrent acts or c) Rarely violent, exploitative, and coercive, but retaining the self-given right to be so and often significantly less powerful.
Generally, the first category is made of large, undemocratic States. Quite clearly a State like the Russian Federation is a violent institution, responsible for supressing ethnic and religious minorities, launching wars, expanding influence, killing journalists, and explicitly denying a large number of freedoms. Even smaller state's like North Korea or Sierra Leone also fit this category, though fortunately they pose (comparatively) less hazards to citizens of other state's.
The second category is slightly less common, and would include a large variety of state's that profess to be Democratic in nature and thus justify their limitations of rights or propagation of warfare on a democratic basis. State's like Brazil or the United States would fit here.
The final category is almost exclusively made up of small States that possess neither the resources nor the required level of political centralization to be truly violent, exploitative, and coercive. State's like Iceland or Finland would fit here.
I don't really think that you can deny these if you are aware of the facts. Violence, exploitation, and coercion are the raison d'etre, the meat and potatoes, the bread and butter if you will, of State's. The fact that they are sometimes limited in acting out these abuses or choose not to sometimes is beside the point. The more relevant debate at hand is whether some violent acts of coercion (eg. police action) or exploitation (eg. taxes) are in some way justified.
(ps. American States also fit the bill for being violent, exploitative, and coercive, they are just limited in their ability to always be so by their smaller size and the interference of the Feds)