The San Francisco Police Officers Association is demanding an apology from the 49ers and the NFL -- claiming "your employee" Colin Kaepernick has disrespected cops ... and they won't stand for it.
The SFPOA -- the largest union representing the S.F.P.D -- has fired off a letter to 49ers owner Jed York and NFL commish Roger Goodell to address the "recent ill-advised statements" made by quarterback.
"We will not stand by while he attacks police officers killed in this country with statements such as 'People are on paid leave while people of color are killed.