In the clip we see Madeley's character Judy Heumann – an influential disability rights activist – leading a protest in which she encourages people to "sign 504", referring to Section 504 of the Rehabilitation Act.

When a passerby immediately scrunches up the flier she has been handed, Judy looks understandably demoralised, but then asks her fellow protestors to help her down to the street – against the tide of moving traffic.

After she successfully stops a van, she is then joined on the road by many of the other protestors who –significantly re-energised – resume their chants of "sign 504."

You can watch the clip in full below:

The synopsis for the film reads: "They wouldn't take Judy Heumann's phone calls, so she took their building. In 1977, a young disabled woman (Ruth Madeley) and a scrappy coalition of outsiders decide they've had enough.

"What begins as one impulsive act becomes the longest occupation of a federal building in American history, as hundreds spontaneously seize government offices and refuse to leave until the bureaucrat in their way (Mark Ruffalo) takes action.

"Bringing rebellion in all its forms to the hallowed halls, a movement's accidental leaders struggle to find their path forward where none has ever been paved for them.

It concludes that this is "the revolutionary, irreverent, and deeply human story of the least likely people trying to pull off the impossible and change the lives of millions."

In our 4-star review, said that "Madeley makes a fiery focus" in a film which "tells an incredibly important story in a compelling and accessible way."

Meanwhile, speaking exclusively to Madeley explained: "This is what I’ve been working towards: leading a Hollywood movie. To have this for me was huge."

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