When Rabbi Chaim Greinemann zatzal was asked about Israeli tax evasion, he would respond with the expression the Chazon Ish would employ on this question: “Mitzvah lehatzil meyadam” (based on Avoda Zara 6b), but add this dispensation was on condition the questioner was unlikely to be found out, for reasons of Chillul Hashem (cf. Rashi Baba Kama 113a).
Needless to say, I provide the above information for historical/entertainment purposes only.