[A Greek national flag flutters atop the Athens' University]Greeks started a 48-hour nationwide walkout on Friday in anger at tax and pension reforms pursued by the indebted nation under terms of a multi-billion euro bailout it signed up to last year. The strike called by the country's largest private and public sector unions, saw ships docked at port, disrupted public transport, journalists go on strike and government offices closed. Greece's largest labour union, private sector union GSEE, said the reforms were the "last nail on the coffin" for workers and pensioners who have sacrificed enough after six years of austerity.