June 05, 1866
ATTORNEY-GENERAL'S OFFICE
By direction of the President, you* are hereby instructed to cause the arrest of all prominent. leading, or conspicuous persons called "Fenians" who you may have probable cause to believe have been or may be guilty of violations of the neutrality laws of the United States.
JAMES SPEED,
Attorney-General.
*Addressed to district attorneys and marshals of the United States
Andrew Johnson, Executive Order Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/202561