\ragged commandsLaTeX provides commands \raggedright and \raggedleft, but
none to cancel their effect.
The following code (to be inserted in a package of your own, or as internal LaTeX code) defines a command that restores flush justification at both margins:
\def\flushboth{%
\let\\\@normalcr
\@rightskip\z@skip \rightskip\@rightskip
\leftskip\z@skip
\parindent 1.5em\relax}
There's a problem with the setting of \parindent in the code: it's
necessary because both the \ragged commands set \parindent to
zero, but the setting isn't a constant of nature: documents using a
standard LaTeX class with twocolumn option will have 1.0em by
default, and there's no knowing what you (or some other class) will
have done.