Republican Sinn Féin president Des Dalton has condemned what he called disgraceful scenes at the funeral of former president Ruairí Ó Brádaigh.
Mourners at the funeral shouted at gardaí to leave the graveyard.
A number of gardaí in riot gear were present for the funeral in Roscommon town.
The disturbances delayed the graveside orations.
Mr Ó Brádaigh's son, Conchúr, had earlier spoken about the nature of the policing during his father's funeral.
He criticised what he called the heavy handed and provocative nature of government policing and security at the funeral.
Mr Ó Brádaigh died on Wednesday.
He was a former chief of staff of the IRA in the 1950s, and was a TD for Longford Westmeath from 1957 to 1961.
He founded Provisional Sinn Féin in 1970 and Republican Sinn Féin in 1986. The latter organisation was the political wing of the Continuity IRA.
Mr Ó Brádaigh opposed the Good Friday Agreement.
He retired as president of Republican Sinn Féin in 2009.