One of the country's biggest unions has been forced to pull a video off YouTube, after social media expressed shock and dismay over its suggestion that union members should reassert their "values" in the ALP over same-sex people, environmentalists and other members.

The South Australian branch of United Voice originally posted the clip in late May but removed it on Friday afternoon, with the national office quickly distancing itself from the production.

The video, entitled "have your say", begins with a young couple, who share the same "values" and build a house together.

Then a "lawyer" comes by and moves in. "Some students", "some environmentalists", a "same-sex couple", "many religious orders" and "a group called political staffers" - represented as clowns - also move in.