The big pro-illegal-immigration rally in LA March 25th was sponsored by International Answer (powerline has the scoop on them), according to WaTi. ANSWER is perhaps the world's last remaining Stalinist group. That would explain this:
ANSWER's steering committee includes the Free Palestine Alliance, the Partnership for Civil Justice, the Nicaragua Network, the Korea Truth Commission, the Muslim Student Association, the Mexico Solidarity Network and the Party for Socialism and Liberation.
And also why the march attracted this group, with these signs. Is there some reason why the Left can't protest a political policy unless a bunch of people who truly hate the U.S. organize them?