8 USC 1357: Powers of immigration officers and employees
1357. Powers of immigration officers and employees
(a) Powers without warrant
(5) to make arrests-
(A) for any offense against the United States, if the offense is committed in the officer's or employee's presence, or
(B) for any felony cognizable under the laws of the United States, if the officer or employee has reasonable grounds to believe that the person to be arrested has committed or is committing such a felony,
if the officer or employee is performing duties relating to the enforcement of the immigration laws at the time of the arrest and if there is a likelihood of the person escaping before a warrant can be obtained for his arrest.
18 U.S. Code 111 - Assaulting, resisting, or impeding certain officers or employees
(1)forcibly assaults, resists, opposes, impedes, intimidates, or interferes with any person designated in section 1114 of this title while engaged in or on account of the performance of official duties; or
(2)forcibly assaults or intimidates any person who formerly served as a person designated in section 1114 on account of the performance of official duties during such person's term of service...
Chik-Fil-A is protesting on the 25th.
Why leave that out of the story?