There are many different federal law enforcement agencies. Each has its own specific jurisdiction. As a resident of Minnesota, you are always under the control of any government law enforcement because you are a U.S. citizen. One branch you may have contact with more than others, especially if you travel, is the U.S. Customs and Border Protection.
According to the CBP, it is responsible for keeping the country safe from things and people coming into the country from outside its borders. The main way it does this is through identification verification. Typically, any interaction you have with the CBP starts with identification. An officer will usually ask to see your papers, which could include your passport or other travel documents. This is to verify that you have a legal right to be in the country.
You may be subject to further examination based upon pre-determined criteria. This criteria is based on a variety of factors, including credible reports of threats or issues. If you have a warrant for your arrest from any type of law enforcement, the CBP also knows about that and does have the right to detain you until the proper authorities can collect you.
The CBP uses a range of different records and communications with the airlines and other government agencies to stay informed. This might include the internal records kept by the airline that includes your personal information, which is used to assess the risk, if any, you may pose if allowed to enter the country. This information is only intended to educate and should not be interpreted as legal advice.