Under the "strong recommendation" of Old Jerome, Police Chief Maxime Decamps "gladly" accepted Prince Old Jerome's suggestion.
Originally marginalized within the Police Department, Railway Police Commissioner Marcel Yale was immediately appointed by Maxime Decamps as the Acting Head of the Anti-Subversion Investigation Office. This newly established office would undertake the responsibilities originally meant for the Railway Police Commissioner, becoming the secret police monitoring Paris.
Though the newly established Anti-Subversion Investigation Office is but an inconspicuous force for the stage that Paris is currently in, it gradually expands along with Jerome Bonaparte's power expansion.
As for why it is called Anti-Subversion, it is, of course, one of President Jerome Bonaparte's whims.
Upon solving Marcel Yale's staffing issues, Prince Old Jerome left in a carriage, accompanied eagerly by Maxime Decamps.