The Greek Police have banned demonstrations in Athens on Tuesday and Wednesday as part of security preparations for a visit to the Greek capital by outgoing US President Barack Obama.
Some 5,000 Greek police officers are to be on duty in the capital along with 500 American agents.
Anarchist groups have called for demonstrations to coincide with Obama's visit which comes just before events to mark the anniversary of the 1974 student uprising that was bloodily repressed by Greece's junta.
There will also be work stoppages on public transport on the days of Obama's visit. There will be no electric railway (ISAP) or tram until 10 a.m. on Tuesday and there will be no ISAP after 9 p.m. on Wednesday.
On Friday there will be no Athens metro, ISAP or tram from noon to 4 p.m.