A makeshift memorial outside Burger King, where Pigram was killed by officers serving a warrant as part of the Memphis Safe Task Force. Pigram is one of four men shot dead by Memphis Safe Task Force Agents. (Photo by Brad Vest for the Tennessee Lookout)U.S. Sen. Bill Hagerty released on Tuesday a campaign ad, a more than one-minute spot in which he praised the work of the Memphis Safe Task Force, the alphabet soup of federal agencies, mixed in w…