Dr. King spoke of the Triple Evils: racism, militarism and materialism -- meaning, in contemporary society, capitalism.
The sum total of these evils is U.S. imperialism, the global system
that was committing the violence he came to that church to oppose; the
system of capitalism as it actually exists, that is headquartered in the
United States, and whose violence is the greatest obstacle to the
construction of a humane civilization.
When Dr. King said that “the arc of the moral universe is long, but
it bends toward justice,” he was expressing confidence that humanity
would throw off -- overthrow -- these evil systems.
That did not sit well with the captains of imperialism, and Dr. King was dead exactly one year later.
-- Glen Ford, "MLK and Obama: Two Diametrically Opposed Legacies" (BLACK AGENDA REPORT).