It seems that Olmert would travel abroad (18 times a year while Industry and Trade Minister) and then bill 2 or more charitable organizations for his trip, pocketing the extra payment. This is not just verbal allegations, the police actually have the double receipts. Below is one example of the double billing:
Note the same flight number and date to 2 separate organizations. Interestingly enough the amounts are different.
I can't wait to hear the imaginative excuses for this one.