Canadian intelligence system
... that some of the earliest activities of the Canadian intelligence system involved guarding the Canada-United States border, and preventing U.S. infringement on Canadian neutrality during the U.S. Civil War?
... that some of the earliest activities of the <b id="mwEwg"><a class="mw-redirect" href="./Intelligence_in_Canada" id="mwEwk" rel="mw:WikiLink" title="Intelligence in Canada">Canadian intelligence system</a></b> involved guarding the <a class="mw-redirect" href="./Canada_–_United_States_border" id="mwEwo" rel="mw:WikiLink" title="Canada – United States border">Canada-United States border</a>, and preventing U.S. infringement on Canadian neutrality during the <a class="mw-redirect" href="./U.S._Civil_War" id="mwEws" rel="mw:WikiLink" title="U.S. Civil War">U.S. Civil War</a>?