There is no penalty, it's just an accusation. If any one person has fled from one state or country to another, depending on the severity of the crime committed that person may be extradited to answer the charge accused of under these circumstances. It's up to the judge if any additional charges will be accommodated.
There is no charge by that name in Texas, so I'll take a guess at what you mean.
One possibility is "Harboring a Runaway Child", Penal Code 25.06, a Class "A" misdemeanor.
But what I think you probably are asking about is called "Hindering Apprehension or Prosecution", Penal Code 38.05, a Class "A" Misdemeanor. This includes intentionally hiding, warning, and aiding by any means. If the person is wanted or convicted of a felony offense, then the charge level is a Third Degree Felony.
If you assist a fugitive to escape or hide from authorities, the charge is aiding and abetting. Since prosecutors and police look for all ways to charge, you might also have an obstruction of justice charge.
If you planned or participated in any crimes with the fugitive, an additional charge could be conspiracy. Plus, you'd be charged for each instance of crimes, with all the sub-charges for each act.
The penalty for harboring a fugitive in Louisiana can range from prison time to fines and community service. This varies greatly depending on the type of fugitive and the circumstances of the crime. Fines can reach over $5000 and prison can last as long as about 3 years in most cases. If the fugitive is a murderer, the person who harbors him or her could also be charged as an accessory to the crime.
32 PC harboring a fugitive
Harboring
That's harboring a fugitive. You will be charged with Harboring a Fugitive, and you will be labeled as an accessory to the crime they commited so you will be sentenced for that.
what is the punishment for harboring someone with a warrant
Aiding a criminal? Harboring a fugitive.
39-11-411: Accessory After the Fact
Harboring a fugitive refers to the crime of knowingly hiding a wanted criminal from the authorities. Federal and state laws, which vary by state, govern the crime of harboring a fugitive. Although supplying funds may make one an accessory after the fact, supplying financial assistance to a fugitive does not rise to the level of harboring or concealing. The federal statute, 18 U.S.C. § 1071, requires proof of four elements: (1) proof that a federal warrant had been issued for the fugitive' s arrest, (2) that the accused had knowledge that a warrant had been issued, (3) that the accused actually harbored or concealed the fugitive, and (4) that the accused intended to prevent the fugitive' s discovery or arrest. Source: http://definitions.uslegal.com
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"Harboring a Fugitive" can be either a federal OR a state crime depending on whether the wanted individual was wanted on either a federal or a state crime.
The US Supreme Court has ruled that only crimes which directly result in the death of a human being (murder and related offences) can be capital offences. So no, a person cannot be executed for harboring a fugitive.
In Canada, harboring a minor runaway is a gross misdemeanor. While the penalty can vary, someone convicted of this crime could spend up to one year in jail.