Bernays's most extreme political propaganda activities were said to be conducted on behalf of the multinational corporation United Fruit Company (renamed Chiquita Brands International in 1984) and the U.S. government to facilitate the successful overthrow (see Operation PBSUCCESS) of the democratically elected president of Guatemala, Colonel Jacobo Arbenz Guzman.
Bernay's mest ekstreme politiske propaganda aktiviteter siges at være udført på vegne af det multinationale firma United Fruit Company (i dag Chiquita Brands International) og den amerikanske regering for at lette den succesfulde fjernelse (se Operation PBSUCCESS) af den demokratisk valgte præsident i Guatemala, Jacobo Arbenz Guzman.