Chinese university tutor Xie Shu's core subject is Communist ideology, but he has diversified from the dry annals of political doctrine for a more hands-on subject: seduction.
French Prime Minister Manuel Valls promised there would be "no let-up" in the government's reform agenda and reiterated a pledge to bring down stubbornly high unemployment.
Brazilian President Dilma Rousseff took to social media rather than make a formal May Day address to underscore her government's commitment to workers' rights.
Former Chilean president and socialist champion Michelle Bachelet, who has proposed tax reforms and a new constitution for her country, is expected to unseat conservatives Sunday in a runoff election.
The Socialist government's plans to reform France's debt-ridden pension system , to be presented to ministers this month, fail to address the core problems and could spark fresh tensions with Brussels.
Germany's opposition Social Democrats mark their 150th birthday Thursday, with French President Francois Hollande as the only foreign speaker and conservative Chancellor Angela Merkel in the audience.
Former French socialist party leader Martine Aubry said Tuesday she had come under investigation for "involuntary manslaughter and causing bodily harm by negligence" in an asbestos scandal.