removing spaces from start of visual block

I find myself often to align blocks of text and thought to create a
regex to remove all leading spaces in a block.

p.e.

text a
text b
text c
text d

I would like to select a visual block around these 4 pieces of text
and remove
all leading spaces, how can I do this?
- I can't use "^" because it aligns the block at the beginning of the
line.

Another possibility is to left align the text in the selection but I
have not found any command to do this.

I checked also the align plugin but it didn't do what I wanted to do.

Thanks in advance.
Rameo

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