[Mariner]

"The warrant was served on February 2, 1934; MacCracken was paroled in the custody of his counsel to appear at the bar of the Senate at noon, February 5, 1934. "

Who do you think actually served that warrant? Did the Sgt at Arms dispatch the Capitol Police to arrest MacCracken?

Do you think MacCracken actually saw handcuffs or the inside of a police car...much less a jail cell?

And he wasn't even in the employ of the Executive Branch.

[Ray76]

His employer is not the issue, he failed to comply with a Congressional subpoena.

MacCracken was on several occasions held in custody by the Sargeant at Arms of the Senate. After MacCracken had been released and upon a new warrant being issued for his ignoring a subsequent subpoena, the Sargeant at Arms reported Feb. 12, 1934 that he went to MacCracken’s place of business to arrest MacCracken but he was unable to locate him as MacCracken was in hiding. 73rd Cong., 78 Cong. Rec. 2410 (1934) https://archive.org/details/congressionalrec78aunit