"white authorities" is correct and usable in written English.
You can use this phrase when referring to people in positions of power or influence who are of the white race or ethnicity. For example: "The white authorities in the city have been criticized for their decision to close the public library."
"There was a sense that if Johnson's dominant image were allowed to stand it would disrupt the balance of power and threaten the control of white authorities," said Theresa Runstedtler, author of Jack Johnson, Rebel Sojourner.
Violent clashes between the white authorities and peaceful protesters ensued; innocent people died.
Many blacks say the identity requirement reminds them of white authorities' intimidation in the days of segregation.
Mr. Mugabe was one of many black nationalists jailed for years by the white authorities under emergency powers.
"I don't know how many times they" — the white authorities — "came into this house, asking questions like, 'Where did you get the money to build your house?
Chilford (LeRoy McClain), an African who has become a Christian minister and also works for the white authorities adjudicating local problems, has the power to stop the marriage.
He became, to some, a symbol of defiance in the face of white authority.
helped create a worthwhile canon of films in which "the brother man" consistently trumped "the other man" (white authority).
Their chief job is to portray, with villainous leers, an assortment of corrupt white authority figures (lawyers, judges, guards).
Light-skinned children in otherwise brown families were a vivid reminder of black powerlessness in the face of white authority.
For some, especially many gang members, he became a symbol of black defiance in the face of white authority.
