Since the implementation of the Group Representation Constituencies, critics have accused the ruling party of gerrymandering. The electoral system reduces the chances of opposition representation in parliament with a "winner takes all" system. As pointed by NGO group Maruah Singapore, it "creates a barrier to entry" for smaller opposition political parties to contest in the general elections as they may find it hard to field a 5-member team of talents, it also allows for the "free-riding of untested candidates" who get in on the back of stronger team members, such as the PAP candidates brought in to the Tanjong Pagar GRC, which was uncontested for 14 years when helmed by the popular Lee Kuan Yew. The Elections Department, in charge of redrawing electoral boundaries without the need of parliamentary approval, was established as part of the executive branch under the Prime Minister of Singapore, rather than as an independent body. Critics have accused it of giving the ruling party the power to decide polling districts and polling sites through electoral engineering, based on poll results in previous elections. Opposition politician Sylvia Lim has stated in parliament,“The entire electoral boundary re-drawing process is completely shrouded in secrecy, chaired by the Secretary to the Cabinet. There are no public hearings, no minutes of meeting published. The revised boundaries are released weeks or even days before Nomination Day. The report makes no attempt to explain why certain single seats are retained while others are dissolved, nor why new GRCs are created or old ones re-shaped.” Cheng San GRC and Eunos GRC were examples of constituencies dissolved by the Elections Department after opposition parties gained ground in elections, with voters redistributed to other constituencies.