I suspect law enforcement agencies have more concern with the growing recruitment efforts taking place since the election by and among white supremacist groups - skinheads, neo-nazis, aryan nation, white militia groups, "christian" patriot groups, etc. - than with code pink or MoveOn.org...or even the ANSWER anarchists.
In fact, it goes back well before the last election.
The FBI released a report last year (under Bush) on the growing "White Supremacist Recruitment of Military Personnel Since 9/11" (
report - pdf) .... the concern since the election is that these groups have been become much more vocal and expansive in their recruitment efforts