The Supreme Court has agreed to take on cases that could decide if corporations can ignore parts of federal law based on the religious beliefs of their owners. The cases center around the controversy over whether for-profit corporations must fully cover birth control in the health insurance they provide for their employees. Two companies — Hobby Lobby and Conestoga Wood — object to provisions in the Affordable Care Act requiring companies to provide contraceptive coverage in employees’ health plans. The firms say they oppose birth control mandates on religious grounds. The case could force a rehashing of the landmark Citizens United decision, which ruled companies have freedom of expression rights that allow unlimited spending on political campaigns. The court could now decide whether companies also have religious freedom rights.