If neoconservatives and progressives truly understood fascism, they would stop using the word as a smear term. That is because both groups, along with most political figures and commentators, embrace fascist ideas and policies.
Fascism's distinguishing characteristic is a "mixed economy." Unlike socialists and communists who seek to abolish private business, fascists are content to let business remain in private hands. Instead, fascists use regulations, mandates, and taxes to control business and run (and ruin) the economy. A fascist system, then, is one where private businesses serve politicians and bureaucrats instead of consumers. Does the modern American economy not fit the definition of fascism?