After four years of grueling work without pay as a nanny in Bethesda, Md., Zipora Mazengo finally obtained a $1 million judgment against her former employer. The Tanzanian citizen spent five more years attempting to collect.

Her pro bono lawyers at Jenner & Block recognized that the challenge was immense, given that her former employer was Alan Mzengi, an ex-minister at the Embassy of Tanzania in Washington who had since returned to his home country. Under the Vienna Convention on Diplomatic Relations, diplomats enjoy immunity from lawsuits.