WASHINGTON -- The U.S. Census Bureau on Friday dropped Acorn as a partner for the 2010 Census after two separate hidden-camera videos captured four employees of the community organization giving tax advice on running a brothel to a man posing as an aspiring politician and a woman posing as his girlfriend and a prostitute.

The Census Bureau earlier this year signed up the Association of Community Organizations for Reform Now, one of the nation's largest community groups, as a national partner for the decennial census, a role...