Vince Majestyk is a tough watermelon farmer who also happens to be a former convict. He's trying to get by and make an honest living, but when a group of migrant workers shows up looking for work, he finds himself in trouble. These workers are actually a front for a group of mobsters who want to take over Vince's farm so they can use it to smuggle drugs across the border.
Vince isn't interested in working with the criminals, so they start to threaten him and his property. They even try to use violence to intimidate him, but Vince isn't one to back down. He fights back, and ends up getting arrested for assault.
Once he's released from jail, Vince decides to take matters into his own hands. He teams up with a woman named Nancy (played by Linda Cristal) and together they start to plot their revenge against the mob. They go on a cross-country chase, tracking down the criminals and taking out their henchmen one by one.
In the end, Vince and Nancy manage to take down the mob and save his farm from their clutches. It's a classic tale of a man standing up for his rights in the face of adversity, and Charles Bronson's performance as Vince is both tough and sympathetic. Overall, Mr. Majestyk is a fun and exciting action movie that's well worth watching.