Yes, the US Marshall Service is part of the Department of Justice.
https://en.wikipedia.org/wiki/United_States_Marshals_Service
And, although they operate under the direction of the Attorney General, the following brings up an interesting point:
The Marshals Service serves as the enforcement and security arm of the U.S. federal judiciary
If the court issues an order and the attorney general subsequently refuses to enforce that order, couldn’t the court then issue an order placing the attorney general under arrest?
If Marshalls ignore an order from a judge, what does the judge saying “I compel you” or “I hold you in contempt” do?
Everything you’re saying is just judges saying words at people. The administration has already shown they’re willing to ignore words coming out of the courts.
We’re very close to the “don’t quote laws to men with swords” territory here.