allude / refer
An indirect hint versus a direct pointing.
Use allude for an indirect mention. Use refer for a direct one. If you name the thing outright, you are referring, not alluding. Both verbs take to.
Examples
UseShe alluded to the scandal without naming it.
UseShe referred to the 2019 report by title.
AvoidShe alluded to the 2019 report by title. (If the title is given, referred is the verb.)