After the 1973 Roe decision, anti-abortion groups responded with a strategic plan to reverse the decision and recriminalize abortion through laws that seek to codify the belief that life begins at conception. Some of these criminal statutes create a new crime for causing a pregnancy loss by injuring a pregnant person, and others expand the definitions of "person" or "another" to include zygotes, embryos, and fetuses under existing criminal codes for murder, manslaughter, or related charges.