Self-styled radical defense lawyer Stanley L. Cohen will lose his law license and spend time in prison after pleading guilty Monday to charges he violated federal tax law by operating a cash law business.

Appearing in the U.S. District Court for the Northern District in Syracuse, Cohen pleaded to the felony of corruptly obstructing and impeding the Internal Revenue Service for failing to file taxes stretching back to 2004 and failing to report $35,000 in cash payments he received in 2008 and 2010.