US Labor Party?

Both Republicans and Democrats claim to be the party of the working class, but it is questionable that either side is truly a voice for them and in their own ways continue to fail the working class. Are there any movements out there that are organizing to unify labor unions across industries and other working groups that lack representation?

Other than money (which the working class doesn't have) and the push back of CEOs and oligarchs (who have all the money), what is necessary to get a US political party for Labor to be a voice in our government without being shutdown/dismissed as just communism or socialism?

If anyone has insight into viable groups that are pushing towards labor causes and representation within the constraints of capitalism and democracy, can you post those links here?