Task: Text Categorization
Input (English): insofar as those cases hold that the testimony of a witness given at a former trial, and read at the instant trial, because of the nonavailability of the witness cannot be impeached by contradictory statements made subsequent to the former trial, or by statements made prior thereto but where the impeacher clearly shows that he had no knowledge of such contradictory statements, they are, and each of them is, overruled.
Output (English): overruling