The legal aspects of ritual slaughter include the regulation of slaughterhouses, butchers, and religious personnel involved with traditional shechita (Jewish) and dhabiha (Islamic). Regulations also may extend to butchery products sold in accordance with kashrut and halal religious law. Governments regulate ritual slaughter, primarily through legislation and administrative law. In addition, compliance with oversight of ritual slaughter is monitored by governmental agencies and, on occasion, contested in litigation. The most controversial aspect of ritual slaughter is the legality of unstunned slaughter, where animal welfare concerns regularly clash with religious concerns, and split public opinion. In Western countries, law reaches into every stage of ritual slaughter, from the slaughtering of livestock to the sale of kosher or halal meat. In the United States, for example, courts have ruled that kosher butchers may be excluded from collective bargaining units, a Jewish beit din (court) may forbid trade with disapproved butchers, retail sellers implicitly stipulate their compliance with rabbinic courts, a state law (NY) may incorporate a rabbinical ruling on kosher labeling, and kashrut symbols may be subject to trade infringement laws. In Jones v. Butz, the action involved "a challenge, under the Free Exercise and Establishment Clauses of the First Amendment, to the Humane Slaughter Act and in particular to the provisions relating to ritual slaughter as defined in the Act and which plaintiffs suggested involved the Government in the dietary preferences of a particular religious (e.g., Orthodox Jews) group. The court held that there is no violation of Establishment Clause because no excessive governmental entanglement and by making it possible for those who wish to eat ritually acceptable meat to slaughter the animal in accordance with the tenets of their faith, Congress neither established the tenets of that faith nor interfered with the exercise of any other.