Ballot Initiative Strategy Center
The Ballot Initiative Strategy Center, or BISC, based in Washington, DC, advocates for progressive ballot measures and against conservative ballot measures.
BISC and petition blocking
At the event, BISC presenter Kelly Evans encouraged unions to run “signature blocking” campaigns—organized efforts to urge citizens not to sign ballot petitions that would harm progressive interests. She said such efforts "help build and mobilize your base," and "force your opposition to spend more money or volunteer hours gathering signatures."
See petition blocking.