Nyorai kupfuurira kweiyi ndima - Pakutanga kwa1962, Harrop akaendeswa (pakukumbira kwaSheldon B. Vance) kuBureau yeAfrica Affairs, kwaakanga aine mhosva yezvinhu zvehupfumi muCongo (ipapo pakati peCold War-era Congo Crisis
) uye kuparadzana kweKatanga. Muna 1963, Harrop akaenda kuBrussels kunova mukuru wepakati-giredhi rezvehupfumi uye mutevedzeri weEconomic and Financial Affairs Commission.