The phrase "act of shame" is correct and usable in written English.
It can be used to describe an action that causes embarrassment or guilt, often in a moral or ethical context.
Example: "The politician's act of shame was revealed when the public learned about his unethical dealings."
Alternatives: "shameful act" or "deed of shame".
It's an act of shame and of gross cowardice.
Editors consider adjudication a slap on the wrist – this is not the case; Dacre for one, considers adjudications against his newspaper as "a real act of shame".
The only truthful thing is to say that they were all true at the same time, they all mattered in their different ways in different eras, and an achievement in one area does not morally eclipse an act of shame in another, or indeed vice versa.
Every culture has its own criteria of right and wrong and while some things may be absolutely normal in your culture, they may be considered as an act of shame in others.
Perhaps because they always tarry with shame, Twitter's users carefully police the act of shaming, treating it as a privileged tool and punishing those who employ it incorrectly.
We need you to no longer act out of shame because one of the ways we act out through shame is rage, harm and hurt to others, shaming, and isolation.
Showing nudity, especially by older women, is a weapon of last resort, considered an act of deep shame here and a great curse directed at men.
He retired to the New York brownstone, where he burned many of the papers from his machine years, an act of both shame and pride: he knew that the squalor they depicted had also been the prelude to something semi-splendid.
You must throw up in a group of men, and throw up loudly, turning what is normally an act of private shame into a public declaration of pride.
As art, it was an unforgettable act of public shaming.
It is also an act of self-shaming, a public display of wounds that has opened the author to accusations of narcissism and self‑aggrandisement.
