Immigrant-rights activists attempted to block the road to federal immigration agents’ headquarters in Atlanta on Monday, demanding President Obama stop deporting any more illegal immigrants after last week’s Supreme Court stalemate. Led by the Not1More campaign, which webcast the protest, the demonstrators called Mr. Obama to hamstring U.S. Immigration and Customs Enforcement (ICE), the deportation agency, saying it’s up to the administration to protect illegal immigrants now. “We are defending the security and stability of our families, sending a direct message to the Obama Administration,” said Carlos Medina, a member of the Georgia Latino Alliance for Human Rights. “We know...