Day of Anger (1969) on Netflix

A scruffy garbage boy becomes the pupil of a famed gunfighter, and the stage for confrontation is set when the gunman becomes unhinged and overruns the boy's town through violence and corruption.

Amiable, unassertive Scott Mary picks up the trash, cleans the toilets, sweeps the floors in the town of Clifton. Then a gunfighter comes to town. He offers advice and guidance to Scott who quickly begins to toughen and mature, thus upsetting the balance of power in the town.

—dinky-4 of Minneapolis

In the small town of Clifton, the young outcast and son of a prostitute, Scott, does the community's dirty work, sweeping the streets, keeping tidy the local brothel, the saloon, and the bank. With dreams of becoming a fearsome sharpshooter, Scott will find the opportunity of a lifetime when the ageing gunslinger, Frank Talby, rides into town, and before long, takes the eager apprentice under his wing. Little by little, the timid student will turn into a tough man and a deadly gunfighter, unbeknownst to him, that a strong tie from the past links Talby with the peaceful Clifton. Could it be an old score? Either way, inevitably, Scott will have to choose sides, and finally, toughen up.

—Nick Riganas