This brought it into sharp conflict with the centrists who “peddle their wares in the shadow of the Popular Front” (as Trotsky put it in the ’30s), from Sri Lanka to Chile, France and Portugal in the ’70s, as well as in the Vietnam “anti-war” movement in the U.S., and in El Salvador and Mexico in the ’80s and ’90s.
Ito ang nagdulot ng matinding banggaan sa mga sentrista na “nagbebenta ng kanilang mga gamit sa anino ng popular na prente” (sa pagkakahulugan ni Trotsky noong dekada ‘30), mula sa Sri Langka hanggang sa Tsile, Pransya at Portugal noong dekada ’70 pati na rin sa Byetnam na “anti-digmaang” kilusan sa E.U., at sa El Salbador at Meksiko noong dekada ’80 at ’90.