yes and no. They seized those funds under the pretext that Mt. Gox didn't register as a licensed money transmitter even though there was no clear guidance that such a license was necessary at the time. The real reason was I believe because they wanted to put the squeeze on Mark to pressure him to aid in their Silk Road investigation.  These kinds of ham-fisted police tactics are common and it's we, the honest law-abiding users who get caught in the crossfire.