I can only tell you the law of this state (Ohio) seems to be directed toward urging the public to give reasonable assistance to police officers in the apprehension of fleeing suspects:
"2921.23 Failure to aid a law enforcement officer.
"(A) No person shall negligently fail or refuse to aid a law enforcement officer, when called upon for assistance in preventing or halting the commission of an offense, or in apprehending or detaining an offender, when such aid can be given without a substantial risk of physical harm to the person giving it.
"(B) Whoever violates this section is guilty of failure to aid a law enforcement officer, a minor misdemeanor."
But be careful lest you go too far in our fair Buckeye State:
"3761.03 Damages in case of lynching.
"A person assaulted and lynched by a mob may recover, from the county in which such assault is made, a sum of not to exceed five hundred dollars; or, if the injury received therefrom is serious, a sum of not to exceed one thousand dollars; or, if such injury results in permanent disability to earn a livelihood by manual labor, a sum of not to exceed five thousand dollars."
and:
"3761.07 County's right of action against member of mob.
"The county, in which a lynching occurs, may recover from any of the persons composing a mob the amount of a judgment and costs rendered against it, under sections 3761.01 to 3761.10, inclusive, of the Revised Code, in favor of the legal representatives of a person killed or seriously injured by such mob. A person present, with hostile intent, at a lynching is a member of the mob and is liable under this section."
So there.
Frank2135