Prentis told General Strike USA that he had full support from his members and they were now recruiting support for the campaign outside the workplace, sending representatives into community groups to garner support.
Prison officers are to hold protests outside jails on Thursday, 30 June in solidarity with members of PCS and three education unions who will be on strike.
And a circular from the journalists' union calls on members to hold workplace stoppages and help local picket lines on the national day of action.
The Prison Officers' Association (POA) issued a statement calling for pensions protest meetings on 30 June "at each establishment throughout England, Wales, Scotland and Northern Ireland."
In an email circular to members of the National Union of Journalists' general secretary Jeremy Dear says: "We need to take action together and we can all do something, joining the picket lines of other unions, holding special branch and chapel meetings, and attending rallies to support the strikers.
On 30 June, PCS members fighting over jobs, pay, and pensions will be joined on strike by members of the Association of Teachers and Lecturers (ATL), National Union of Teachers (NUT), and University and College Union (UCU) who want to stop changes to their pension scheme.
NUT (National Union of Teachers) members have voted overwhelmingly in favour of strike action to defend teachers' pensions, with a massive 92% in favour of strike action.
Commenting on the decision by the National Association of Head Teachers (NAHT) to ballot for strike action, Christine Blower, General Secretary of the National Union of Teachers, the largest teachers union, said:
"Today's announcement by Chief Secretary to the Treasury, Danny Alexander has made it crystal clear that there is no intention on the part of Government to continue the negotiations on pensions in a serious and open manner. It would appear they have already decided the changes they wish to make to public sector pensions regardless of the consequences or the facts."
The NUT National Executive today (Wednesday, 15 June) unanimously endorsed national strike action over pensions on 30 June.
More than a quarter of a million civil and public servants today joined teachers in voting for a strike over cuts to their pensions, as well as jobs and pay.
The union says the government's slash and burn approach to tackling the budget deficit will mean vital public services are axed, hundreds of thousands of public sector workers will be thrown out of work, and those that remain will have their pay and pensions cut.
Members of civil service pension schemes face a doubling or tripling of their contributions as well as having to work longer for less pension -- and have ruled out any negotiations on their decision to use the CPI measure of inflation to uprate pensions instead of RPI.
The government is sticking to its proposals despite the National Audit Office, Lord Hutton, himself, and most recently the Commons public accounts committee confirming public sector pensions are affordable now and sustainable in future.
PCS general secretary Mark Serwotka said: "This result shows that public servants, who provide vital services from the cradle to the grave, will not stand back while everything they have ever worked for is taken from them.
"The government admits that money cut from pensions will go straight to the Treasury to help pay off the deficit in what is nothing more than a tax on working in the public sector. The very modest pay and pensions of public servants did not cause the recession, so they should not be blamed or punished for it.
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