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It is indeed obstruction, though the official title of the penal code (Section 195.05) is "Obstructing governmental administration in the second degree." Here is the code:
§ 195.05 Obstructing governmental administration in the second degree.
A person is guilty of obstructing governmental administration when he intentionally obstructs, impairs or perverts the administration of law or other governmental function or prevents or attempts to prevent a public servant from performing an official function, by means of intimidation, physical force or interference, or by means of any independently unlawful act, or by means of interfering, whether or not physical force is involved, with radio, telephone, television or other telecommunications systems owned or operated by the state, or a county, city, town, village, fire district or emergency medical service or by means of releasing a dangerous animal under circumstances evincing the actor’s intent that the animal obstruct governmental administration.
Obstructing governmental administration is a class A misdemeanor.
It's a very broad law -- essentially, any unlawful act which is committed intentionally so as to obstruct the administration of government or allow the government to carry out their duties is considered obstruction. Anything from providing false evidence to refusing to walk through a metal detector at a courthouse could fall under this code.
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