Mob-connected union boss Johnny Friendly (Lee J. Cobb) revels in the absolute authority he holds over the docks, exercising a formidable grip that leaves little room for dissent. The police and the Waterfront Crime Commission are well aware of Friendly’s nefarious activities, including a slew of murders linked to his operations; however, the terrified witnesses opt to play “D and D,” which stands for “deaf and dumb,” choosing the safety of silence over the perilous risk of revealing the truth.

At the heart of this grim narrative is Terry Malloy, a once-promising boxer turned dockworker whose brother, Charley “the Gent” (Rod Steiger), is the right-hand man to the ruthless Friendly. In a striking turn of fate, Terry was coerced into losing a critical match under the manipulation of Charley, a decision orchestrated to benefit Friendly’s illicit gambling interests. Now trapped in this murky world, Terry becomes unwittingly embroiled in the violent underbelly of the waterfront when he is manipulated into luring fellow dockworker Joey Doyle (Ben Wagner) to a rooftop, believing that Friendly’s henchmen merely wish to intimidate Joey into silence about their crooked dealings. The shocking turn occurs when Terry watches in sheer horror as they coldly murder Joey by hurling him off the rooftop, leaving Terry in an agonizing confrontation with Friendly, who threatens and bribes him to maintain his silence.

In a chilling conversation, Friendly recounts how he rose from a meager existence, stating, “My mother raised ten kids on my father’s pension… when I was 16, I had to beg for work.” He goes on to emphasize that the docks employ 2,000 workers who pay a staggering $72,000 in protection money, reinforcing the idea that their very livelihoods lie in his hands. He stands resolute in his assertion that the entire operation hinges on maintaining silence; one whistleblower could bring the whole wall of crime crashing down. Thus, he holds dominion over who is allowed to work at the docks, instilling fear and compliance through intimidation.

Everything changes when Father Barry, a priest dedicated to justice, implores Terry to testify for the Waterfront Crime Commission. Yet, driven by fear and loyalty to the code of silence, Terry resists. Meanwhile, Joey’s sister, Edie (Eva Marie Saint), fueled by grief and anger over her brother’s untimely demise, pressures Father Barry to take action against the mob-controlled union. Although Barry stresses the need for patience—since the community knows of the brutal undercurrents guiding their lives but remains terrified—he ultimately calls a meeting at the church to rally support among the dockworkers.

In a moment fraught with tension, Terry is sent to spy on Barry’s meeting, yet he finds himself drawn to Edie, who despite warnings from Pop Doyle (John F. Hamilton) about Terry’s dangerous connections, feels an unexpected attraction to his gentler side. As the violence of the mob permeates every aspect of dock life, a fellow worker, Timothy J. “Kayo” Dugan (Pat Henning), who expresses a willingness to testify, becomes the next victim of Friendly’s machinations, crushed under a load of whiskey in a staged accident.

As Terry grapples with his own complicity in Joey’s death, he begins to question his choices when Edie, unaware of his past, reciprocates his feelings. Faced with a moral dilemma, he confides in Father Barry and Edie about the events leading to Joey’s murder, only to have Edie horrified and subsequently break ties with him. This harrowing moment serves to ignite his conscience further, propelling him toward the decision to testify, despite the looming threat that Friendly has placed over his head.

With pressure mounting, Friendly escalates his tactics, ordering Charley to ensure Terry’s silence. In a desperate attempt, Charley tries to bribe him into compliance with offers of a secure job, and ultimately resorts to threats, willing to wield violence to secure his brother’s silence. But Terry’s indignation brews as he holds Charley accountable for the lost potential of his boxing career, lamenting, “I could have been a contender, instead of a bum, which is what I am—let’s face it,” before Charley, realizing he has failed, hands him a gun and encourages him to flee.

In a fateful turn, Terry finds refuge with Edie, who, after a struggle with her feelings, opens her heart to him. But when Friendly’s men brutally murder Charley, it sets off a series of events leading Terry to confront his destiny. After discovering his brother’s lifeless body laid as bait for his own demise, Terry is driven by vengeance but is ultimately prevented from killing Friendly by Father Barry, who urges him to fight back through his testimony.

As the courtroom drama unfolds, Terry reveals incriminating evidence that links Friendly to Joey’s murder and other criminal schemes, causing the mob to sever ties. However, post-testimony, Terry becomes an outcast—shunned by former friends and even betrayed by a neighborhood boy who once idolized him, exemplifying the steep price of his integrity. Torn between Edie’s hope for a new life away from the docks and his loyalty to his fellow workers, Terry resolves to return to the docks during recruitment, facing a cold reception when he’s the only one left un-hired.

In a climactic showdown, Terry confronts Friendly, boldly declaring his pride in testifying against him. Their altercation swings into a brutal brawl, with Terry gaining the upper hand until Friendly’s thugs join forces to universally overpower him. However, witnessing this brutal fight compels the dockworkers to stand in solidarity with Terry, rejecting the authority of Friendly and pushing him into the river as a display of their unity. Encouraged by the resolute Father Barry and Edie’s unwavering support, the once-battered Terry quickly rises to join his fellow workers, stepping together into a future unshackled by fear, leaving a vengeance-driven Friendly alone, swearing revenge that will fall upon deaf ears as the garage door closes behind them.