In this verse there is a stop from the main story. Here John provides background information about the man's parents being afraid of the Jews. (See: [[rc://en/ta/man/jit/writing-background]])
Here "Jews" is a synecdoche for the "Jewish leaders" who opposed Jesus. Alternate translation: "they were afraid of what the Jewish leaders might do to them" (See: [[rc://en/ta/man/jit/figs-synecdoche]])
Here "be thrown out of the synagogue" is a metaphor for no longer being allowed to go into the synagogue and no longer belonging to the group of people who attend services at the synagogue. Alternate translation: "he would not be allowed to go into the synagogue" or "he would no longer belong to the synagogue" (See: [[rc://en/ta/man/jit/figs-metaphor]])