In the following passage, I know here the word "authority" should not be the meaning: "political or administrative power and control", it's not suitable in this context.
May be, I think the meaning of it will be "tradition or rite and ritual". I'm not sure.
how should I understand this phrase "Blind faith in authority" or the word "authority"?
Inasmuch as the Buddha teaches that all genuine progress on the path of virtue is necessarily dependent upon one’s own understanding and insight, all dogmatism is excluded from the Buddha’s teaching. Blind faith in authority is rejected by the Buddha, and is entirely opposed to the spirit of his teaching.
"Fundamentals of Buddhism" by Nyanatiloka Mahåthera, Page. 5