unscrupulous attack

Critics have launched an unscrupulous attack on the agency, for purely political purposes.

Were they to live in a perpetual state of defence till one of them went under?—all the advantages of unscrupulous attack being left to the enemy.

I shall certainly take some opportunity to correct my statement prominently in the Illustrated London News; I hope I should do so in any case; but in this case it supports my main actual contention; that there is in the press a very vulgar and unscrupulous attack on the historic Christian Church.

He was drawn into the controversy against his will by Bossuet, who requested him to endorse an unscrupulous attack upon Madame Guyon.

His person was the subject of more than one unscrupulous attack by politicians in opposition, who did not hesitate to exploit the German origin and the German sympathies of the prince in order to inflame the masses.