They are protesting a D.C. museum guard's ignorance of the federal law that permits breast feeding in public.

Although, according to the story:

The museum quickly apologized to Aita and posted a note on its Facebook page, saying it had made its "security staff aware of the federal law allowing women to breastfeed in any public or private location. . . . We regret that this incident occurred and we apologize for the frustration it has caused."

Wait a minute, does that mean lactivists are entitled by federal law to barge their way into anyone's private residence and start breast feeding their babies? Or is that just a poorly worded apology?

UPDATE: The law (H.R.2490, Treasury and General Government Appropriations Act, 200 Public Law No: 106-58 (Sec. 647):

Authorizes a woman to breastfeed her child on Federal property if the woman and child are otherwise authorized to be present at the location.

So, if you don't want strange women breast feeding on your own property you are within your rights to order them to move along.

UPDATE II: In 2007, Pennsylvania passed its own law permitting a woman to breastfeed anywhere she has a right to be, "public or private." So the Haverford Township Board of Commissioners can rest easy. There is no need for them to pass their own ordinance outlawing discrimination against those who engage in public breast feeding. I know they'll be relieved.