I have many ideas that would be effective, efficient, and devastating to the left. A "Department of Dirty Tricks," a concept of total economic war, and another idea (that is completely legal, so do not worry) that is so good, I won't even give it an obscure title. And until I'm paid a princely sum, in my brain they will remain and the republicans, tea party, libertarians, etc., will continue to waste horrendous resources inefficiently fighting the left.
But one that I can let go of it opening up a second front on the left. One that would strike at the resources that keep them alive, and permit them the luxury of 24-7 activism, propaganda, indoctrination, and politicking:
Cut off their funding.
Adam Piggott explains it much better here, but the idea is very simple. If you cut the source of blood off for the parasites, then they will be too busy foraging for food (and GASP! JOBS!) that they won't have time to protest, apply for government grants, block interstates, apply for government hand outs, or park their lazy worthless asses in college. Oh they'll put up a stink, and they'll certainly shut down interstates. But after two weeks of no food, no rent, no student loans, and no free transportation, they will rearrange their priorities to find food, clothing, and shelter when their WIC check doesn't come through, their paycheck at the university bounces, or the funding for their worthless public services program is cut.
Understand the MAIN job of a leftist is to constantly legitimize, rationalize, and validate the theft of other people's money. If you simply cut it off and force them to work real jobs like the rest of us, they won't have time to write 6 different letters to the same congressman, vote 5 different times for the same politician, nor apply for welfare in 4 different states.
Of course, this all pre-supposes republicans and our politicians grow a pair, which is the weakest part of this entire plan.