After the 2013 election his government was marked by the pursuit of a number of its critics on sedition charges, the imprisonment of opposition leader Anwar Ibrahim following a conviction for sodomy, the implementation of a Goods and Services Tax (GST), and an ongoing scandal involving state investment firm 1Malaysia Development Berhad (1MDB) which led to rallies calling for Najib's resignation, spearheaded by the grassroots movement Bersih.