Common Sense Note
Parents need to know that this Disney production features a tough, New York street-level milieu, in which confrontations frequently threaten to culminate in fist-fighting, and often do. There are menacing scenes of adults threatening to beat children using clubs and chains, and a rivalry between different subsets of kids looks somewhat like street gangs. One boy smokes cigarettes. There is a strong pro-union (and anti-management) sentiment throughout.
Sexual
Content
A scandal headline about a nude corpse, and that's about it.
Violence
Much fist-fighting and beat-downs, some incorporated into dance choreography (think West Side Story), some not (as in a bare-knuckle boxing match). Often grown men threaten to beat kids. Kids attack back with slingshots.
Language
"Damn" and "dumbasses" uttered.
Social
Behavior
While Jack deceives his friends (and himself, to a point) about his past, and is coerced into quitting the strike, he eventually does the right thing, especially when his friend David is threatened. While it's never made clear in the dialogue, there's a sense of the melting-pot of New York, with Irish, Jewish, and African American kids overcoming their gang-like divisions to unite in the strike. Adults are mostly meanies, although a few high-placed ones come to the rescue in the end. There are only a few girls in the story, but they stand with the good guys.
Consumerism
References to newspapers of yesteryear, most of which don't exist now.
Drugs / Tobacco /
Alcohol
Raffish boys smoke (and steal their cigarettes and cigars), and a little child drinks beer to win a bet.