Perhaps the most serious challenges to human rights in Algeria are the substantial restrictions on freedom of association and of assembly. There are also serious controls on freedom of expression and of the press. Other issues include extensive corruption, official impunity, the overuse of pretrial detention, substandard prison conditions, prisoner abuse, the absence of a free judiciary, restrictions on freedom of movement, violence and discrimination against women, limited workers' rights, and the commission by government agents of arbitrary killings. According to the Human Rights Watch report from 2017, Algerian authorities increasingly resorted to criminal prosecutions in 2016 against bloggers, journalists, and media figures for peaceful speech, using articles in the penal code criminalizing "offending the president", "insulting state officials" or "denigrating Islam". The report added that they have also prosecuted labor activists who organized or called for peaceful demonstrations on charges such as "unauthorized gathering".